Low Power, Wide Supply Range, Low Cost Unity-Gain Difference Amplifier AD8276

Transcription

1 Low Power, Wide Supply Range, Low Cost Unity-Gain Difference Amplifier AD87 FEATURES Wide input range Rugged input overvoltage protection Low supply current: μa maximum Low power dissipation:. mw at VS =. V Bandwidth: khz CMRR: 8 db minimum, dc to khz Low offset voltage drift: ± μv/ C maximum (AD87B) Low gain drift: ppm/ C maximum (AD87B) Enhanced slew rate:. V/μs Wide power supply range: Single supply:. V to 3 V Dual supplies: ± V to ±8 V 8-lead SOIC and MSOP packages APPLICATIONS Voltage measurement and monitoring Current measurement and monitoring Instrumentation amplifier building block Differential output instrumentation amplifier Portable, battery-powered equipment Medical instrumentation Test and measurement GENERAL DESCRIPTION The AD87 is a general-purpose unity-gain difference amplifier intended for precision signal conditioning in power critical applications that require both high performance and low power. The AD87 provides exceptional common-mode rejection ratio (8 db) and high bandwidth while amplifying signals well beyond the supply rails. The on-chip resistors are laser-trimmed for excellent gain accuracy and high commonmode rejection ratio. They also have outstanding gain temperature coefficient. The amplifier s common-mode range extends to almost double the supply voltage, making it ideal for single-supply applications that require a high common-mode voltage range. FUNCTIONAL BLOCK DIAGRAM +VS 7 AD87 kω kω IN SENSE kω kω +IN 3 REF VS Figure. Table. Difference Amplifiers by Category Low Distortion High Voltage Current Sensing Low Power AD87 AD8 AD8 (U) AD87 AD87 AD9 AD83 (U) AD873 AD8 (B) AD87 AD8 (B) AMP3 AD8 (B) U = unidirectional, B = bidirectional. The AD87 is unity-gain stable. Intended as a difference amplifier, it can also be connected in a high precision, singleended configuration with G =, +, +, or +½. The AD87 operates on single supplies (. V to 3 V) or dual supplies (± V to ±8 V). The maximum quiescent supply current is μa, which makes it ideal for battery operated and portable systems. The AD87 is available in the space-saving 8-lead MSOP and SOIC packages. It is specified for performance over the industrial temperature range of C to +8 C and is fully RoHS compliant. 79- Rev. Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. One Technology Way, P.O. Box 9, Norwood, MA -9, U.S.A. Tel: Fax: Analog Devices, Inc. All rights reserved.

2 AD87 TABLE OF CONTENTS Features... Applications... Functional Block Diagram... General Description... Revision History... Specifications... 3 Absolute Maximum Ratings... Thermal Resistance... Maximum Power Dissipation... Short-Circuit Current... ESD Caution... Pin Configurations and Function Descriptions... Typical Performance Characteristics... 7 Theory of Operation... Circuit Information... Driving the AD87... Power Supplies... Input Voltage Range... Applications Information... 3 Configurations... 3 Differential Output... 3 Instrumentation Amplifier... Current Source... Outline Dimensions... Ordering Guide... REVISION HISTORY /9 Revision : Initial Version Rev. Page of

3 AD87 SPECIFICATIONS VS = ± V to ± V, VREF = V, TA = C, RL = kω connected to ground, unless otherwise noted. Table. Grade B Grade A Parameter Conditions Min Typ Max Min Typ Max Unit INPUT CHARACTERISTICS System Offset μv vs. Temperature TA = C to +8 C μv Average Temperature TA = C to +8 C. μv/ C Coefficient Vv. Power Supply VS = ± V to ±8 V μv/v Common-Mode Rejection Ratio VS = ± V, VCM = ±7 V, RS = Ω 8 8 db Input Voltage Range ( VS). (+VS) 3 ( VS). (+VS) 3 V Impedance 3 Differential 8 8 kω Common Mode kω DYNAMIC PERFORMANCE Bandwidth khz Slew Rate V/μs Settling Time to.% V step on output, μs CL = pf Settling Time to.% μs GAIN Gain Error.... % Gain Drift TA = C to +8 C ppm/ C Gain Nonlinearity V = V p-p ppm PUT CHARACTERISTICS Output Voltage Swing VS = ± V, TA = C to +8 C VS +. +VS. VS +. +VS. V Short-Circuit Current Limit ± ± ma Capacitive Load Drive pf NOISE Output Voltage Noise f =. Hz to Hz μv p-p f = khz 7 7 nv/ Hz POWER SUPPLY Supply Current μa vs. Temperature TA = C to +8 C μa Operating Voltage Range ± ±8 ± ±8 V TEMPERATURE RANGE Operating Range + + C Includes input bias and offset current errors. The input voltage range may also be limited by absolute maximum input voltage or by the output swing. See the Input Voltage Range section in the Theory of Operation for details. 3 Internal resistors are trimmed to be ratio matched and have ±% absolute accuracy. Output voltage swing varies with supply voltage and temperature. See Figure through Figure 9 for details. Includes amplifier voltage and current noise, as well as noise from internal resistors. Supply current varies with supply voltage and temperature. See Figure and Figure for details. Rev. Page 3 of

4 AD87 VS = +.7 V to <± V, VREF = midsupply, TA = C, RL = kω connected to midsupply, G = difference amplifier configuration, unless otherwise noted. Table 3. Grade B Grade A Parameter Conditions Min Typ Max Min Typ Max Unit INPUT CHARACTERISTICS System Offset μv vs. Temperature TA = C to +8 C μv Average Temperature TA = C to +8 C. μv/ C Coefficient vs. Power Supply VS = ± V to ±8 V μv/v Common-Mode Rejection VS =.7 V, VCM = V 8 8 db Ratio to. V, RS = Ω VS = ± V, VCM = V to +7 V, RS = Ω 8 8 db Input Voltage Range ( VS). (+VS) 3 ( VS). (+VS) 3 V Impedance 3 Differential 8 8 kω Common Mode kω DYNAMIC PERFORMANCE Bandwidth khz Slew Rate.. V/μs Settling Time to.% 8 V step on output, μs CL = pf, VS = V GAIN Gain Error.... % Gain Drift TA = C to +8 C ppm/ C PUT CHARACTERISTICS Output Swing TA = C to +8 C VS +. +VS. VS +. +VS. V Short-Circuit Current Limit ± ± ma Capacitive Load Drive pf NOISE Output Voltage Noise f =. Hz to Hz μv p-p f = khz nv/ Hz POWER SUPPLY Supply Current TA = C to +8 C μa Operating Voltage Range V TEMPERATURE RANGE Operating Range + + C Includes input bias and offset current errors. The input voltage range may also be limited by absolute maximum input voltage or by the output swing. See the Input Voltage Range section in the Theory of Operation for details. 3 Internal resistors are trimmed to be ratio matched and have ±% absolute accuracy. Output voltage swing varies with supply voltage and temperature. See Figure through Figure 9 for details. Includes amplifier voltage and current noise, as well as noise from internal resistors. Supply current varies with supply voltage and temperature. See Figure and Figure for details. Rev. Page of

5 AD87 ABSOLUTE MAXIMUM RATINGS Table. Parameter Rating Supply Voltage ±8 V Maximum Voltage at Any Input Pin VS + V Minimum Voltage at Any Input Pin +VS V Storage Temperature Range C to + C Specified Temperature Range C to +8 C Package Glass Transition Temperature (TG) C Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. THERMAL RESISTANCE The θja values in Table assume a -layer JEDEC standard board with zero airflow. Table. Thermal Resistance Package Type θja Unit 8-Lead MSOP 3 C/W 8-Lead SOIC C/W MAXIMUM POWER DISSIPATION The maximum safe power dissipation for the AD87 is limited by the associated rise in junction temperature (TJ) on the die. At approximately C, which is the glass transition temperature, the properties of the plastic change. Even temporarily exceeding this temperature limit may change the stresses that the package exerts on the die, permanently shifting the parametric performance of the amplifiers. Exceeding a temperature of C for an extended period may result in a loss of functionality. MAXIMUM POWER DISSIPATION (W) MSOP θ JA = 3 C/W SOIC θ JA = C/W 7 AMBIENT TEMERATURE ( C) T J MAX = C Figure. Maximum Power Dissipation vs. Ambient Temperature SHORT-CIRCUIT CURRENT The AD87 has built-in, short-circuit protection that limits the output current (see Figure 3 for more information). While the short-circuit condition itself does not damage the part, the heat generated by the condition can cause the part to exceed its maximum junction temperature, with corresponding negative effects on reliability. Figure and Figure 3, combined with knowledge of the part s supply voltages and ambient temperature, can be used to determine whether a short circuit will cause the part to exceed its maximum junction temperature. 79- ESD CAUTION Rev. Page of

6 AD87 PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS REF IN +IN 3 VS AD87 TOP VIEW (Not to Scale) NC = NO CONNECT 8 7 NC +VS SENSE Figure 3. MSOP Pin Configuration 79-3 REF IN +IN 3 VS AD87 TOP VIEW (Not to Scale) NC = NO CONNECT 8 7 NC +VS SENSE Figure. SOIC Pin Configuration 79- Table. Pin Function Descriptions Pin No. Mnemonic Description REF Reference Voltage Input IN Inverting Input 3 +IN Noninverting Input VS Negative Supply SENSE Sense Terminal Output 7 +VS Positive Supply 8 NC No Connect Rev. Page of

7 AD87 TYPICAL PERFORMANCE CHARACTERISTICS VS = ± V, TA = C, RL = kω connected to ground, G = difference amplifier configuration, unless otherwise noted. N: MEAN:.8 SD: HITS 3 SYSTEM OFFSET (µv) 3 3 SYSTEM OFFSET VOLTAGE (µv) Figure. Distribution of Typical System Offset Voltage 79-7 REPRESENTATIVE DATA TEMPERATURE ( C) Figure 8. System Offset vs. Temperature, Normalized at C 79-8 N: MEAN:.87 SD:. HITS 3 GAIN ERROR (µv/v) CMRR (µv/v) Figure. Distribution of Typical Common-Mode Rejection 79- REPRESENTATIVE DATA TEMPERATURE ( C) Figure 9. Gain Error vs. Temperature, Normalized at C 79-9 V S = ±V CMRR (µv/v) GAIN (db) 3 V S = +.7V REPRESENTATIVE DATA TEMPERATURE ( C) Figure 7. CMRR vs. Temperature, Normalized at C 79-7 k k k M M FREQUENCY (Hz) Figure. Gain vs. Frequency, VS = ± V, +.7 V 79- Rev. Page 7 of

8 AD87 V S = ±V 8 V REF = MIDSUPPLY CMRR (db) 8 COMMON-MODE VOLTAGE (V) V S =.7V V S = V k k k M FREQUENCY (Hz) Figure. CMRR vs. Frequency PUT VOLTAGE (V) Figure. Input Common-Mode Voltage vs. Output Voltage, V and.7 V Supplies, VREF = Midsupply 79-8 V REF = V PSRR (db) 8 +PSRR PSRR COMMON-MODE VOLTAGE (V) V S =.7V V S = V k k k M FREQUENCY (Hz) Figure. PSRR vs. Frequency PUT VOLTAGE (V) Figure. Input Common-Mode Voltage vs. Output Voltage, V and.7 V Supplies, VREF = V 79- COMMON-MODE VOLTAGE (V) 3 V S = ±V V S = ±V PUT VOLTAGE SWING (V) REFERRED TO SUPPLY VOLTAGES +V S T A = C T A = + C T A = +8 C T A = + C 3 PUT VOLTAGE (V) Figure 3. Input Common-Mode Voltage vs. Output Voltage, ± V and ± V Supplies 79-3 V S 8 8 SUPPLY VOLTAGE (±V S ) Figure. Output Voltage Swing vs. Supply Voltage and Temperature, RL = kω 79- Rev. Page 8 of

9 AD87 PUT VOLTAGE SWING (V) REFERRED TO SUPPLY VOLTAGES +V S V S 8 8 SUPPLY VOLTAGE (±V S ) T A = C T A = + C T A = +8 C T A = + C Figure 7. Output Voltage Swing vs. Supply Voltage and Temperature, RL = kω 79-7 SUPPLY CURRENT (µa) SUPPLY VOLTAGE (±V) Figure. Supply Current vs. Dual Supply Voltage, VIN = V 79- +V S 8 PUT VOLTAGE SWING (V) REFERRED TO SUPPLY VOLTAGES T A = C T A = + C T A = +8 C T A = + C SUPPLY CURRENT (µa) 7 3 V S k k k LOAD RESISTANCE (Ω) Figure 8. Output Voltage Swing vs. RL and Temperature, VS = ± V SUPPLY VOLTAGE (V) Figure. Supply Current vs. Single-Supply Voltage, VIN = V, VREF = V 79- +V S. V REF = MIDSUPPLY PUT VOLTAGE SWING (V) REFERRED TO SUPPLY VOLTAGES T A = C T A = + C T A = +8 C T A = + C SUPPLY CURRENT (µa) V S = ±V V S = +.7V +. V S PUT CURRENT (ma) Figure 9. Output Voltage Swing vs. I and Temperature, VS = ±V TEMPERATURE ( C) Figure. Supply Current vs. Temperature 79- Rev. Page 9 of

10 AD87 3 SHORT-CIRCUIT CURRENT (ma) I SHORT+ I SHORT V/DIV.%/DIV. µs TO.% 3.8µs TO.% TEMPERATURE ( C) Figure 3. Short-Circuit Current vs. Temperature 79-3 µs/div TIME (µs) Figure. Large-Signal Pulse Response and Settling Time, V Step, VS = ± V SLEW RATE (V/µs)..8.. SR +SR V/DIV.%/DIV.3 µs TO.%.µs TO.% TEMPERATURE ( C) Figure. Slew Rate vs. Temperature, VIN = V p-p, khz 79- µs/div TIME (µs) Figure 7. Large-Signal Pulse Response and Settling Time, V Step, VS =.7 V NONLINEARITY (ppm/div) V/DIV PUT VOLTAGE (V) Figure. Gain Nonlinearity, VS = ± V, RL kω 79- µs/div Figure 8. Large-Signal Step Response 79-8 Rev. Page of

11 AD87 3 V S = ±V PUT VOLTAGE (V p-p) V S = ±V OVERSHOOT (%) 3 3 V V V 8V k k k M FREQUENCY (Hz) Figure 9. Maximum Output Voltage vs. Frequency, VS = ± V, ± V CAPACITIVE LOAD (pf) Figure 3. Small-Signal Overshoot vs. Capacitive Load, RL kω 79-. k. V S = V. PUT VOLTAGE (V p-p) V S =.7V.. k k k M FREQUENCY (Hz) Figure 3. Maximum Output Voltage vs. Frequency, VS = V,.7 V 79-3 mv/div NOISE (nv/ Hz). k k k FREQUENCY (Hz) Figure 33. Voltage Noise Density vs. Frequency µv/div 79-3 C L = pf C L = pf C L = 3pF C L = 7pF µs/div Figure 3. Small-Signal Step Response for Various Capacitive Loads 79- s/div Figure 3.. Hz to Hz Voltage Noise 79-3 Rev. Page of

12 AD87 THEORY OF OPERATION +VS 7 kω kω IN SENSE kω kω IN+ 3 REF VS CIRCUIT INFORMATION AD87 Figure 3. Functional Block Diagram The AD87 consists of a low power, low noise op amp and four laser-trimmed on-chip resistors. These resistors can be externally connected to make a variety of amplifier configurations, including difference, noninverting, and inverting configurations. Taking advantage of the integrated resistors of the AD87 provides the designer with several benefits over a discrete design. DC Performance Much of the dc performance of op amp circuits depends on the accuracy of the surrounding resistors. This can be verified by a simple examination of the typical difference amplifier configuration, as shown in Figure 3. The output voltage is = R V ( IN + IN ) V V R3 as long as the following ratio of the resistors is tightly matched: R R = R R3 The resistors on the AD87 are laid out to optimize their matching, and they are laser trimmed and tested for their matching accuracy. Because of this trimming and testing, the AD87 can guarantee high accuracy and consistency for specifications such as gain drift, common-mode rejection, and gain error, even over a wide temperature range. AC Performance The feature size is much smaller in an IC than on a PCB, so the corresponding parasitics are also smaller, which helps the ac performance of the AD87. For example, the positive and negative input terminals of the AD87 op amp are not pinned out intentionally. By not connecting these nodes to the traces on the PCB, the capacitance remains low, resulting in both improved loop stability and common-mode rejection over frequency DRIVING THE AD87 With all configurations presenting at least several kilohms (kω) of input resistance, the AD87 is easy to drive. Drive the AD87 with a low impedance source: for example, another amplifier. The gain accuracy and common-mode rejection of the AD87 depend on the matching of its resistors. Even source resistance of a few ohms can have a substantial effect on these specifications. POWER SUPPLIES Use a stable dc voltage to power the AD87. Noise on the supply pins can adversely affect performance. Place a bypass capacitor of. μf between each supply pin and ground, as close as possible to each supply pin. Use a tantalum capacitor of μf between each supply and ground. It can be farther away from the supply pins and, typically, it can be shared by other precision integrated circuits. The AD87 is specified at ± V, but it can be used with unbalanced supplies, as well. For example, VS = V, +VS = V. The difference between the two supplies must be kept below 3 V. INPUT VOLTAGE RANGE The AD87 is able to measure input voltages beyond the rails because the internal resistors divide down the voltage before it reaches the internal op amp. Figure 3 shows an example of how the voltage division works in a difference amplifier configuration. In order for the AD87 to measure correctly, the input voltages at the input nodes of the internal op amp must stay within. V of the positive supply rail and can exceed the negative supply rail by. V. R R + R (V IN+ ) R3 R R V IN V IN+ R R + R (V IN+ ) Figure 3. Voltage Division in the Difference Amplifier Configuration For best long-term reliability of the part, voltages at any of the part s inputs (Pin, Pin, Pin 3, or Pin ) should stay within +VS V to VS + V. For example, on ± V supplies, input voltages should not exceed ±3 V. R 79-3 Rev. Page of

13 AD87 APPLICATIONS INFORMATION CONFIGURATIONS The AD87 can be configured in several ways; see Figure 38 to Figure. All of these configurations have excellent gain accuracy and gain drift because they rely on the internal matched resistors. Note that Figure 39 shows the AD87 as a difference amplifier with a midsupply reference voltage at the noninverting input. This allows the AD87 to be used as a level shifter. As with the other inputs, the reference must be driven with a low impedance source to maintain the internal resistor ratio. An example using the low power, low noise OP77 as a reference is shown in Figure 37. INCORRECT CORRECT kω kω 3 kω kω IN V = V IN Figure. Noninverting Amplifier, Gain = IN 3 kω kω kω kω 79- V AD87 AD87 REF V REF + OP77 Figure 37. Driving the Reference Pin IN kω kω +IN 3 kω kω V = V IN+ V IN Figure 38. Difference Amplifier, Gain = V = V IN Figure. Noninverting Amplifier, Gain = DIFFERENTIAL PUT Certain systems require a differential signal for better performance, such as the inputs to differential analog-to-digital converters. Figure 3 shows how the AD87 can be used to convert a single-ended output from an AD8 instrumentation amplifier into a differential signal. The AD87 internal matched resistors at the inverting input maximize gain accuracy while generating a differential signal. The resistors at the noninverting input can be used as a divider to set and track the common-mode voltage accurately to midsupply, especially when running on a single supply or in an environment where the supply fluctuates. The resistors at the noninverting input can also be shorted and set to any appropriate bias voltage. Note that the VBIAS = VCM node indicated in Figure 3 is internal to the AD87 because it is not pinned out IN AD8 V S + + IN kω kω IN V REF R R AD87 R R V BIAS = V CM +IN 3 kω kω V REF = MIDSUPPLY V = V IN+ V IN Figure 39. Difference Amplifier, Gain =, Referenced to Midsupply kω kω IN 3 V = V IN kω kω Figure. Inverting Amplifier, Gain = V S 79-3 Figure 3. Differential Output With Supply Tracking on Common-Mode Voltage Reference The differential output voltage and common-mode voltage of the AD8 is shown in the following equations: VDIFF_ = V+ V = GainAD8 (V+IN V IN) VCM = (VS+ VS )/ = VBIAS Refer to the AD8 data sheet for additional information. Rev. Page 3 of

14 AD87 INSTRUMENTATION AMPLIFIER The AD87 can be used as a building block for a low power, low cost instrumentation amplifier. An instrumentation amplifier provides high impedance inputs and delivers high commonmode rejection. Combining the AD87 with an Analog Devices low power amplifier (examples provided in Table 7) creates a precise, power efficient voltage measurement solution suitable for power critical systems. IN +IN R G A A R F R F kω kω kω REF kω AD87 V V = ( + R F /R G ) (V IN+ V IN ) Figure. Low Power Precision Instrumentation Amplifier Table 7. Low Power Op Amps Op Amp (A, A) Features AD8 Dual micropower op amp AD87 Precision dual micropower op amp AD87 Low cost CMOS micropower op amp AD87 Dual precision CMOS micropower op amp 79- It is preferable to use dual op amps for the high impedance inputs, because they have better matched performance and track each other over temperature. The AD87 difference amplifier cancels out common-mode errors from the input op amps, if they track each other. The differential gain accuracy of the in-amp is proportional to how well the input feedback resistors (RF) match each other. The CMRR of the in-amp increases as the differential gain is increased ( + RF/RG), but a higher gain also reduces the common-mode voltage range. Refer to A Designer s Guide to Instrumentation Amplifiers for more design ideas and considerations. CURRENT SOURCE The AD87 difference amplifier can be implemented as part of a voltage-to-current converter or a precision constant current source as shown in Figure. The internal resistors are tightly matched to minimize error and temperature drift. If the external resistors R and R are not well-matched, they will be a significant source of error in the system, so precision resistors are recommended to maintain performance. The ADR8 provides a precision voltage reference and integrated op amp that also reduces error in the signal chain. The AD87 has rail-to-rail output capability, which allows higher current outputs. V+.V V+ 7 9 kω 3 V REF ADR kω kω AD87 kω N39 R R R LOAD Figure. Constant Current Source I O =.V(/kΩ + /R) R = R 79- Rev. Page of

15 AD87 LINE DIMENSIONS PIN. BSC.38. COPLANARITY.. MAX SEATING PLANE COMPLIANT TO JEDEC STANDARDS MO-87-AA Figure. 8-Lead Mini Small Outline Package [MSOP] (RM-8) Dimensions shown in millimeters. (.98).8 (.89). (.7) 3.8 (.97) 8. (.).8 (.8). (.98). (.) COPLANARITY. SEATING PLANE.7 (.) BSC.7 (.88).3 (.3). (.).3 (.) 8. (.98).7 (.7). (.9). (.99).7 (.). (.7) COMPLIANT TO JEDEC STANDARDS MS--AA CONTROLLING DIMENSIONS ARE IN MILLIMETERS; INCH DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN. Figure 7. 8-Lead Standard Small Outline Package [SOIC_N] Narrow Body (R-8) Dimensions shown in millimeters and (inches) 7-A Rev. Page of

16 AD87 ORDERING GUIDE Model Temperature Range Package Description Package Option Branding AD87ARZ C to +8 C 8-Lead SOIC_N R-8 AD87ARZ-R7 C to +8 C 8-Lead SOIC_N, 7" Tape and Reel R-8 AD87ARZ-RL C to +8 C 8-Lead SOIC_N, 3" Tape and Reel R-8 AD87BRZ C to +8 C 8-Lead SOIC_N R-8 AD87BRZ-R7 C to +8 C 8-Lead SOIC_N, 7" Tape and Reel R-8 AD87BRZ-RL C to +8 C 8-Lead SOIC_N, 3" Tape and Reel R-8 AD87ARMZ C to +8 C 8-Lead MSOP RM-8 HP AD87ARMZ-R7 C to +8 C 8-Lead MSOP, 7" Tape and Reel RM-8 HP AD87ARMZ-RL C to +8 C 8-Lead MSOP, 3" Tape and Reel RM-8 HP AD87BRMZ C to +8 C 8-Lead MSOP RM-8 HQ AD87BRMZ-R7 C to +8 C 8-Lead MSOP, 7" Tape and Reel RM-8 HQ AD87BRMZ-RL C to +8 C 8-Lead MSOP, 3" Tape and Reel RM-8 HQ Z = RoHS Compliant Part. 9 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D79--/9() Rev. Page of