Transimpedance Amplifier with 100mA Input Current Clamp for LiDAR Applications

Transcription

1 EVALUATION KIT AVAILABLE MAX4658/MAX4659 Transimpedance Amplifier with 1mA Input General Description The MAX4658 and MAX4659 are transimpedance amplifiers for optical distance measurement receivers for LiDAR applications. Low noise, high gain, low group delay, and fast recovery from overload make these parts ideal for distance-measurement applications. Important features include 45nA RMS input-referred noise, an internal 1mA clamp, 18kΩ (MAX4658) and 36kΩ (MAX4659) transimpedance, and greater than 36MHz bandwidth. An offset input allows adjustment of input offset current. Operating from a +3.3V supply, the MAX4658 and MAX4659 consume only 7mW. The MAX4658 and MAX4659 are available in a 3mm x 3mm, 8-pin TDFN package or bare die, and are specified over the -4 C to 85 C operating temperature range. Applications Optical Distance Measurement LIDAR Receivers Benefits and Features 45nA RMS Noise Two Transimpedance Values Available 18kΩ (MAX4658) 36kΩ (MAX4659) 36MHz Minimum Bandwidth Internal Clamp For Input Current Up To 1mA Offset Adjust Input 7mW Power Dissipation 3.3V Operation Ordering Information appears at end of data sheet. Simplified Block Diagram VCC Industrial Safety Systems Autonomous Driving Systems IN GAIN STAGE kΩ GAIN STAGE 2 x1.4 or x2.8 (15Ω load) OUT+ CCAP VBIAS OUT- 27Ω CLAMP BIAS 3.2kΩ OFFSET GND ; Rev ; 6/17

2 MAX4658/MAX4659 Transimpedance Amplifier with 1mA Input Absolute Maximum Ratings Supply Voltage...-.5V to +4.2V Current Into IN...+1mA Voltage at OUT+, OUT-...V CC - 1.2V to V CC +.5V Voltage at CCAP...-.3V to 1.2V Continuous Power Dissipation (T A = +85 C, derate 24.4mW/ C above +85 C.) mW Operating Temperature Range C to +85 C Operating Junction Temperature Range (die) C to +15 C Storage Temperature Range C to +15 C Soldering Temperature (reflow) C Die Attach Temperature...+4 C Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Package Information 8-TDFN PACKAGE CODE Outline Number Land Pattern Number 9-59 Thermal Resistance, Single-Layer Board: Junction to Ambient (θ JA ) 55 Junction to Case (θ JC ) 8 Thermal Resistance, Four-Layer Board: Junction to Ambient (θ JA ) 42 Junction to Case (θ JC ) 8 T833+1F For the latest package outline information and land patterns (footprints), go to Note that a +, #, or - in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer board. For detailed information on package thermal considerations, refer to Maxim Integrated 2

3 MAX4658/MAX4659 Transimpedance Amplifier with 1mA Input Electrical Characteristics (V CC = +2.97V to +3.63V, 15Ω AC-coupled load between OUT+ and OUT-, T A = -4 C to +85 C, C IN =.25pF (Note 1)) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Power Supply Current I CC 21 3 ma Input Bias Voltage V IN I IN = 1µA V Transimpedance Linearity Small-Signal Transimpedance (Note 2) MAX4658 I IN = I INCENTER ±2µA, I OFFSET =, Note 2 Note 1: Limits are 1% production tested at T A = +25 C. Note 2: I INCENTER is the input current that results in a differential output voltage of V. Note 3: Not production tested, guaranteed by design and characterization. 6 % Z 21 MAX4658, I IN < 2µA P-P kω Small-Signal Transimpedance Z 21 MAX4659, I IN < 1µA P-P 36.4 kω OFFSET Input Transimpedance MAX MAX Input Clamping Current 1 ma Output Common-Mode Voltage MAX4658 MAX4659 V CC Differential Output Offset ΔV OUT I IN = ma -27 mv Output Impedance Z OUT Single ended Ω Maximum Differential Output Voltage V OUT(MAX) V CC -.25 MAX4658, I IN = ±1mA P-P. V OUT = V OUT + P-P - V OUT - P-P MAX4659, I IN = ±1mA P-P. V OUT = V OUT + P-P - V OUT - P-P 48 Input Resistance R IN 45 Ω Bandwidth BW MAX4658, V CC = 3.3V, Note MAX4659, V CC = 3.3V 52 kω V mv P-P Input-Referred Noise i n BW = 267MHz 45 na RMS Input Noise Density f = 267MHz 2.1 pa/hz 1/2 MHz Maxim Integrated 3

4 MAX4658/MAX4659 Transimpedance Amplifier with 1mA Input Typical Operating Characteristics (V CC = +3.3V, C IN =.5pF, T A = +25 C, unless otherwise noted.) SUPPLY CURRENT vs. SUPPLY VOLTAGE SUPPLY CURRENT vs. INPUT DC CURRENT V CCAP vs. TEMPERATURE SUPPLY CURRENT (ma) T A = +85 C toc1a I DC-IN = μa T A = +25 C T A = -4 C SUPPLY CURRENT (ma) T A =+ 85 C T A = +55 C T A = -1 C T A = -4 C toc1b T A = +25 C CCAP VOLTAGE (mv) toc2a SUPPLY VOLTAGE (V) INPUT CURRENT (μa) TEMPERATURE ( C) INPUT BIAS VOLTAGE (mv) V IN vs. INPUT CURRENT toc2b OUTPUT DIFFERENTIAL VOLTAGE (mv) OUTPUT DIFFERENTIAL VOLTAGE vs. INPUT DC CURRENT I DC-IN = μa I OFFSET = -1μA I OFFSET = -2μA I OFFSET = -3μA I OFFSET = μa toc3a I OFFSET =+1μA I OFFSET = +2μA OUTPUT DIFFERENTIAL VOLTAGE (mv) OUTPUT DIFFERENTIAL VOLTAGE vs. OFFSET ADJUSTMENT CURRENT INPUT I DC-IN = -5μA I DC-IN = -1μA I DC-IN = μa toc3b I DC-IN = +5μA I DC-IN = +1μA INPUT CURRENT (μa) I OFFSET = +3μA INPUT CURRENT (μa) OFFSET ADJUSTMENT CURRENT INPUT (μa) OFFSETADJUSTMENT CURRENT INPUT (μa) OFFSETADJUSTMENT CURRENT INPUT vs. INPUT DC CURRENT V (OUT+)-(OUT-) = -5mV V (OUT+)-(OUT-) = -25mV V (OUT+)-(OUT-) = +5mV toc3c V (OUT+)-(OUT-) = mv V (OUT+)-(OUT-) = +25mV OUTPUT DIFFERENTIAL VOLTAGE (mv) OUTPUT DIFFERENTIAL VOLTAGE vs. INPUT CURRENT T A = -4 C T A = +85 C T A = +55 C T A = -1 C T A = +25 C toc4 TRANSIMPEDANCE (kω) SMALL-SIGNAL TRANSIMPEDANCE vs. TEMPERATURE toc INPUT DC CURRENT(μA) INPUT CURRENT (μa) TEMPERATURE ( C) Maxim Integrated 4

5 MAX4658/MAX4659 Transimpedance Amplifier with 1mA Input Typical Operating Characteristics (continued) (V CC = +3.3V, C IN =.5pF, T A = +25 C, unless otherwise noted.) TRANSIMPEDANCE (kω) TRANSIMPEDANCE vs. INPUT CURRENT toc INPUT CURRENT (μa) INPUT IMPEDANCE (Ω) INPUT IMPEDANCE vs. FREQUENCY toc FREQUENCY (MHz) FREQUENCY RESPONSE FREQUENCY RESPONSE 9 C IN =.25pF toc8a 9 C IN =.55pF toc8b TRANSIMPEDANCE (dbω) TRANSIMPEDANCE (dbω) FREQUENCY (MHz) FREQUENCY (MHz) BANDWIDTH (MHz) -3dB BANDWIDTH vs. INPUT CAPACITANCE toc INPUT CAPACITANCE (pf) TRANSIMPEDANCE (dbω) -3dB BANDWIDTH vs. SUPPLY VOLTAGE toc1 55 C IN =.25pF T A = -4 C 51 T A = +25 C T A = +85 C SUPPLY VOLTAGE (V) Maxim Integrated 5

6 MAX4658/MAX4659 Transimpedance Amplifier with 1mA Input Typical Operating Characteristics (continued) (V CC = +3.3V, C IN =.5pF, T A = +25 C, unless otherwise noted.) INPUT INTEGRATED CURRENT NOISE (na/rms) INTEGRATED INPUT CURRENT NOISE vs. FREQUENCY C IN =.55pF FREQUENCY (MHz) toc11 INPUT REFERRED RMS NOISE (na RMS ) INPUT REFERRED RMS NOISE vs. INPUT CAPACITANCE I IN = na C IN =.55pF 267MHz BANDWIDTH INPUT CAPACITANCE (pf) toc12 9 INPUT REFERRED RMS NOISE vs. INPUT DC CURRENT toc13 PULSE RESPONSE toc14 INPUT REFERRED RMS NOISE (na RMS ) INPUT DC CURRENT (μa) I IN 7μA/div V OUT+ V OUT- I IN 5ps/div V DIFF_OUT 5Ω SYSTEM V DIFF_OUT 15mV/div 1mV/div (AC- COUPLED) PULSE RESPONSE toc15 PULSE RESPONSE toc16 I IN 1μA/div I IN 22mA/div V DIFF_OUT 5mV/div V DIFF_OUT 5mV/div V OUT+ V OUT- 2mV/div (AC - COUPLED) V OUT+ 5mV/div V OUT- (AC- COUPLED) 5ps/div 5Ω SYSTEM 1ns/div 5Ω SYSTEM Maxim Integrated 6

7 MAX4658/MAX4659 Transimpedance Amplifier with 1mA Input Pin Configuration TOP VIEW VCC 1 8 GND IN CCAP 2 3 MAX4658 MAX OUT- OUT+ OFFSET 4 * 5 GND TDFN 3mm x 3mm *THE EXPOSED PAD MUST BE CONNECTED TO THE CIRCUIT BOARD GROUND FOR PROPER THERMALAND ELECTRICAL PERFORMANCE. Pin Description PIN NAME FUNCTION 1 VCC +3.3V Supply Voltage 2 IN Signal Input. Connect to photodiode anode. 3 CCAP Capacitor connection for clamp bias. 4 OFFSET Offset adjustment current input. Apply a current to this input to adjust the effective input offset current. A positive current into the pin produces a negative offset voltage at OUT+ pin. 6 OUT+ Positive 75Ω Output. Increasing input current causes OUT+ to increase. 7 OUT- Negative 75Ω Output. Increasing input current causes OUT- to decrease. 5, 8, EP GND Circuit Ground Maxim Integrated 7

8 MAX4658/MAX4659 Transimpedance Amplifier with 1mA Input Detailed Description The MAX4658 and MAX4659 transimpedance amplifiers are designed for optical distance measurement applications and are comprised of a transimpedance amplifier and a voltage amplifier/output buffer. Gain Stage 1 The signal current at the input flows into the summing node of a high-gain transimpedance amplifier. Shunt feedback through the feedback resistor converts this current into a voltage. An internal Schottky diode clamps input currents up to 1mA (see the Typical Application Circuits). Bypass CCAP (internally connected to the cathode of the internal Schottky diode) with a 1µF capacitor. An external Schottky diode may be added for increased clamping current capability. Gain Stage 2 The second gain stage provides additional gain and converts the transimpedance amplifier single-ended output into a differential signal. Two different versions are available (MAX4658 and MAX4659), each with a different voltage amplifier gain. This stage is designed to drive a 15Ω differential load between OUT+ and OUT-. For optimum supply noise rejection, the outputs should be terminated with a differential load. The single-ended outputs do not drive a DC-coupled grounded load. The outputs should be AC-coupled or terminated to V CC. If a single-ended output is required, both the used and unused outputs should be terminated in a similar manner. Offset Adjustment The OFFSET input accepts an input current that may be used to adjust the input offset current of the TIA. Current flowing into the pin yields a negative offset equivalent to I OSIN /4, where I OSIN is the current flowing into the OFFSET pin. The OFFSET pin is biased to the same voltage as the IN pin. Applications Information Photodiode Noise performance and bandwidth are adversely affected by capacitance on the TIA input node. Select a lowcapacitance photodiode to minimize the total input capacitance on this pin. The TIA is optimized for.5pf of capacitance on the input. Assembling the TIA in die form using chip and wire technology provides the lowest capacitance input and the best possible performance. Supply Filter Sensitive optical receivers require wide-band power supply decoupling. Power supply bypassing should provide low impedance between V CC and ground for frequencies between 1kHz and 7MHz. Isolate the amplifier from noise sources with LC supply filters and shielding. Place a supply filter as close to the amplifier as possible. Maxim Integrated 8

9 MAX4658/MAX4659 Transimpedance Amplifier with 1mA Input Typical Application Circuits DC-Coupled APD Receiver TIA Using 1mA Internal Clamp VPD VCC GAIN STAGE 1 IN 12.8kΩ GAIN STAGE 2 x1.4 or x2.8 (15Ω load) OUT + CCAP VBIAS OUT - 15Ω 1µF 27Ω CLAMP BIAS 3.2kΩ OFFSET GND IOSIN DC-Coupled APD Receiver TIA Using External Schottky Clamp For Higher Input Current Handling VPD VCC GAIN STAGE 1 IN 12.8kΩ GAIN STAGE 2 x1.4 or x2.8 (15Ω load) OUT + CCAP VBIAS OUT - 15Ω 1µF 27Ω CLAMP BIAS 3.2kΩ OFFSET GND IOSIN Maxim Integrated 9

10 MAX4658/MAX4659 Transimpedance Amplifier with 1mA Input Ordering Information PART NUMBER TEMP RANGE PIN-PACKAGE TOP MARKING TRANSIMPEDANCE MAX4658ETA+ -4 C to +85 C 8-TDFN BSE 18.3kΩ MAX4659ETA+** -4 C to +85 C 8-TDFN BSF 36.6kΩ MAX4658E/D** - Dice* 18.3kΩ MAX4659E/D** - Dice* 36.6kΩ *Dice are designed to operate over a -4 C to +1 C junction temperature (Tj) range, but are tested and guaranteed at TA = +25 C. +Denotes a lead(pb)-free/rohs-compliant package T Denotes tape-and-reel. **Future product Contact Maxim for availability. Maxim Integrated 1

11 MAX4658/MAX4659 Transimpedance Amplifier with 1mA Input Revision History REVISION NUMBER REVISION DATE DESCRIPTION PAGES CHANGED 6/17 Initial release For pricing, delivery, and ordering information, please contact Maxim Direct at , or visit Maxim Integrated s website at Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits) shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance. Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc. 217 Maxim Integrated Products, Inc. 11