100MHz INPUT MIXER AND 450kHz IF GAIN CONTROL IC

Transcription

1 1MHz INPUT ER AND 4kHz GAIN CONTROL IC GENERAL DESCRIPTION PACKAGE OUTLINE The NJM87 is an Gain Control IC with 4kHz (standard) input, which operates from.7v to.v supply. It includes a local-buffer, mixer, gain control amplifier, and circuit. The NJM87 is especially designed for digital transceivers with built-in an analog gain control amplifier and a subsequent analog to digital converter circuit. The useful functions of the NJM87 are rail-to-rail output swing of and wide gain control of over 8dB. These features help streamline NJM87V (SSOP14) the subsequent circuit design. FEATURES Operating Voltage.7V to.v Low Operating Current + = 3.3V, no signal Maximum Mixer Input Frequency 1MHz (reference value) Frequency 4kHz (standard) Wide Gain Control Range over 8dB Rail - to - rail Output + = 3.3V Wide Range over 7dB (linear area) Bipolar Technology Package Outline SSOP14 BLOCK DIAGRAM LO DEC LO IN V + 1 V + OUT GC IN Gain Control RF DEC RF IN GND1 OUT GND IN DEC No. Symbol Description 1 RF DEC Mixer Decoupling RF IN Mixer Input 3 GND1 Mixer Ground 4 OUT Mixer Output GND Ground 6 IN Limiter Amplifier Input 7 DEC Decoupling 8 GC IN Gain Control Voltage Input 9 OUT FM Output 1 Output 11 V + Supply Voltage 1 V + 1 for Supply Voltage for Mixer 13 LO IN Local Input 14 LO DEC Local Decoupling Ver

2 REFERENCE Representative Block Diagram Output Signal Output Local Signal 44.MHz 1 1u V + 1 V + 1u.1u 3k 1u Gain Control Gain Control ER RF Signal 4MHz 1.1u.1u.1u 1.k Signal 4kHz filter (BPF) 1.k Simplified Application Block Diagram ( Signal) RF Amp SAW Filter Mixer Local Signal PLL Synthesizer MCF RF Signal Local Signal NJM87 Output Signal Gain Control ucom / DSP Ver

3 Symbols related to Electrical Characteristics SYMBOL Iccq Iccq Icont1 Icont FI CG P1 IIP3 NO PI LO RI RILO ROMNIX FI G 1 (to 4) PI NO PO RI V1(to3) GCR GCS DESCRIBTION Current consumption 1 The current passing through pin1 (V + 1) when V + 1 is supplied to pin 1. No input signal. Current consumption The current passing through pin11 (V + ) when V + is supplied to pin 11. No input signal. Supply current 1 at GC IN / GC IN supply current 1 The current passing through pin8 (GC IN) when the voltage at pin8 is V. Supply current at GC IN / GC IN supply current The current passing through pin8 (GC IN) when the voltage at pin8 is V. Mixer input frequency at RF IN / RF IN input frequency The suitable frequency range of RF input signal at pin (RF IN). At this frequency range, the output signal at pin4 satisfies the gain flatness of within ±3dB. Mixer Conversion Gain The difference between the output signal level at pin4 and the input signal level at pin Mixer input 1dB compression point The RF input signal level at 1dB compression point. Mixer 3 rd order intercept point The RF signal level at 3 rd order interrupt point, where FI1=4MHz, FI=FI1-6.kHz Noise level at OUT / OUT noise level The noise level at pin4 ( OUT) within the frequency range from 4-3.1kHz to 4+3.1kHz Note: This range means the center frequency is 4kHz and the BW is 6.kHz. Input level at LO IN / LO IN input level The suitable level of local input signal at pin13 (LO IN). At this frequency range, the output signal at pin4 ( OUT) satisfies the gain flatness of within ±3dB. Input resistance at RF IN / RF IN input resistance The resistance between pin 1 (RF DEC) and pin (RF IN) Input resistance at LO IN / LO IN input resistance The resistance between pin13 (LO IN) and pin14 (LO DEC) Output resistance at OUT / output resistance The AC resistance at pin 4( OUT) within the range from 4-3.1kHz to 4+3.1kHz Input frequency at IN / IN input frequency The suitable frequency range of input signal at pin6 ( IN). At this frequency range, the output signal level at pin9 ( OUT) is satisfied with the gain flatness of within ±3dB. gain at each of the different GC IN voltage. Input 1dB Compression point The input signal level at 1dB compression point. Noise level at OUT / OUT noise level The noise level at pin9 ( OUT) within the range from 4-3.1kHz to 4+3.1kHz Maximum output voltage at OUT / OUT maximum output voltage The maximum output level at pin9 ( OUT) when input level at pin6 is 3dBuV. Input resistance at IN / IN input resistance The resistance between pin 6 ( IN) and pin9 ( OUT). output The output level at different IN input level Gain control range The range of gain change with GC IN voltage. Gain scaling The ratio of gain change with GC IN voltage Ver

4 ABSOLUTE MAXIMUM RATINGS (Ta= C) PARAMETER SYMBOL RATINGS UNIT Supply Voltage V + 7. V Power Dissipation P d 3 mw Gain Control Voltage GC IN -.3 to V + V Operating Temperature T o p r - 4 to + 8 C Storage Temperature T s t g - to + 1 C RECOMMENDED OPERATING CONDITION (Ta= C) PARAMETER SYMBOL CONDITIONS MIN. TYP. MAX. UNIT Supply Voltage V V ELECTRICAL CHARACTERISTICS Ta = C, V + 1 = V + = 3.3V, RF IN input signal = 4MHz / dbuv, LO IN input signal = 44.MHz / 1dBuV, = 4kHz, Test Circuit 1, unless otherwise noted. PARAMETER SYMBOL CONDITIONS MIN. TYP. MAX. UNIT DC CHARACTERISTICS Current Consumption 1 Iccq No signal, V + 1=3.3V Current Consumption Supply Current at GC IN Iccq No signal, V + =3.3V GC IN = V I cont1 GC IN = V I cont GC IN = V ma ua ER CHARACTERISTICS Mixer Input Frequency at RF IN Conversion Gain FI CG Gain flatness ±3dB at pin4 Voltage gain between pin 4 and pin MHz db Mixer Input 1dB Compression point P1 P1dB rd Order Intercept Point IIP3 Noise Level at OUT Input Level at LO IN Input Resistance at RF IN Input Resistance at LO IN Output Resistance at OUT NO PI LO RI RI LO RO FI1=4MHz FI=FI1-6.kHz Circuit BW = 6.kHz Gain flatness ±3dB at pin 13 Resistance between pin 1 and pin Resistance between pin 13 and pin 14 Test Circuit3 AC resistance at pin dbuv kω Ω Ver

5 PARAMETER SYMBOL CONDITIONS MIN. TYP. MAX. UNIT AMP CHARACTERISTICS Input Frequency at IN FI Gain flatness of ±3dB at pin9 GC IN = 1V 4 1 khz G 1 GC IN = V Gain G GC IN = 1V G 3 GC IN = V db Input 1dB Compression point Noise Level at OUT Maximum Output Voltage at OUT Input Resistance at IN CHARACTERISTICS G 4 GC IN =.V PI NO PO RI P1dB GC IN =.V Test Circuit4 GC IN = V BW = 6.kHz IN = 3dBuV GC IN = V Resistance between pin 6 and pin dbuv kω V1 IN = dbuv mv Output Gain Control CHARACTERISTICS V IN = 6dBuV V3 IN = 1dBuV V Gain Control Range GCR GC IN = to.v db Gain Scaling GCS GC IN = 1 to V db/v Ver

6 TEST CIRCUIT This test circuit allows the measurement of all parameters described in ELECTRICAL CHARACTERISTICS. Test Circuit 1 LO IN Ω 1 V + 1 V + 1u 1u Multimeter Spectrum analyzer Ω Active Probes 1MΩ,pF.1u 3k GC IN 1u Gain Control u.1u.1u 1.7k 1 Directional Coupler RF IN Ω RF IN Ω Active Probes 1MΩ, pf Spectrum analyzer Ω IN Ω Use w hen IIP3 is measured Test Circuit for NO (Noise Level at OUT) V + 1 LO IN Ω 1 1u u HP8447A AD811.1u 1 + db.7k - AMP 7 Spectrum analyzer Ω Ver

7 Test Circuit 3 for RO (Output Resistance at OUT) V + 1 LO IN Ω 1 1u u RF IN Ω 1 Active Probes 1MΩ, pf 3 Spectrum analyzer Ω Test Circuit 4 for NO (Noise Level at OUT) Spectrum analyzer Ω V + Active Probes 1MΩ,pF GC IN 3k 1u.1u 1u Gain Control u.1u 1 Ver

8 TERMINAL FUNCTION (The voltages are measured at Ta= C, V + =3.3V, Test circuit 1, no signal) Pin No. SYMBOL EQUIVARENT CIRCUIT VOLTAGE FUNCTION 1 RF DEC 1 Mixer Decoupling An external decoupling capacitor is connected to enhance stability RF IN 1 3 k k.8v Mixer Input The mixer is designed to work up to 1MHz with the typical input impedance of RinM = 1kΩ 3 GND Mixer Ground 1 4 OUT V 4 Mixer Output An external 4kHz ceramic filter is connected. The typical output impedance is 33Ω. 3 GND Ground 6 IN 11 k k IN = V Limiter Amplifier Input This is an input to the amplifier after passing through external 4kHz ceramic filter. The typical input impedance is 4kΩ. 7 DEC IN = V Decoupling An external decoupling capacitor is connected to enhance stability GC IN -- 7 k Gain Control Voltage Input The gain is changed according to the level of voltage supplied to this pin. The gain is 1dB IN=V, and 9dB IN=.V.. 4k Ver

9 Pin No. SYMBOL EQUIVARENT CIRCUIT VOLTAGE FUNCTION 11 p 9 OUT 1.64V 3k p 7 9 Output This is an output of signal passing though the internal gain control amplifier V 7 1 Received Signal Strength Indicator Output Pin 1 outputs DC level proportional to the log of input signal level to pin6. 1k V + -- Supply voltage for 1 1 V Supply voltage for Mixer 3 13 LO IN 1 13 k k 14.6V Local Input The mixer is designed to work up to 1MHz (reference value) with the typical input impedance of RinM = 1kΩ 14 LO DEC 3 Local Decoupling An external decoupling capacitor is connected to enhance stability. Ver

10 EVALUATION PC BOARD The evaluation board is useful for your design and to have more understanding of the usage and performance of this device. This circuit is the same as TEST CIRCUIT. Note that this board is not prepared to show the recommendation of pattern and parts layout. Circuit Diagram LO IN V + 1 V + OUT GC IN C1 1 R6 R R7 1 1 R4 1 3k C13 C1 C11 C6 C8 1u C14 C9 1.1u IC 1 Gain Control C1 C C u C4 C.1u.1u R1 R R8 R3.7k RF IN OUT IN List of Component Items Designation Value Items Designation Value Items Designation Value Capacitor C1 F Capacitor C11 1uF Resistor R1 1Ω C F C1 F R.7kΩ C3.1uF C13 1uF R3 1Ω C4.1uF C14 F R4 3kΩ C.1uF C1 F R 1Ω C6 F R6 1Ω C7 F R7 1Ω C8 1uF R8 Ω C9.1uF IC IC1 NJM87 C1 F Ver

11 PRINTED CIRCUIT BOARD Circuit Side View R C3 R1 C C4 C1 C C1 IC1 NJM87 C6 C14 C9 R7 C13 C1 C11 R4 C1 R6 R R8 R3 C7 C8 Ground Side View V + 1 OUT V + OUT GC IN Ver

12 TYPICAL CHARACTERISTICS [DC Characteristics] Ta = C, Circuit1, V + 1 = V + = 3.3V, unless otherwise noted..8.7 Current Consumption1 Iccq versus Supply Voltage V+1 No signal.8.7 Current Consumption1 Iccq versus Ambient Temperature Ta No signal V + 1 =.V.6.6 Iccq [ma]..4.3 Iccq [ma]..4.3 V + 1 = 3.3V V + 1 =.7V V+1 [V] Ta [ C] 8 Current Consumption Iccq versus Supply Voltage V+ No signal, GC IN = V 8 Current Consumption Iccq versus Ambient Temperature Ta No signal, GC IN = V V + =.V Iccq [ma] 4 3 Iccq [ma] 4 3 V + = 3.3V V + =.7V V+ [V] Ta [ C] 8 Current Consumption Iccq versus Gain Control Voltage GC IN No signal 8 Supply Current at GC IN Icont versus Gain Control Voltage GC IN 7 7 Iccq [ma] Ta = 8 C Ta = C Ta =-4 C Icont [ua] Ta =-4 C Ta = C Ta = 8 C GC IN [V] GC IN [V] Ver

13 [ER CHARACTERISTICS] Ta = C, Circuit1, V + 1 = V + = 3.3V, RF IN = 4MHz / dbuv, LO IN = 44.MHz / 1dBuV, OUT = 4kHz, unless otherwise noted. OUT Output Level versus RF IN Input Level Mixer Conversion Gain CG versus LO IN Input Level 1 1 OUT Output Level [dbuv CG [db] RF IN Input Level [dbuv] LO IN Input Level [dbuv] Mixer Conversion Gain CG versus RF IN Input Level Mixer Conversion Gain CG versus RF IN Input Frequency FI 1 1 CG [db] - CG [db] RF IN Input Level [dbuv] FI [MHz] 1 Mixer 3rd Order Intercept point IIP3 F!1=4MHz FI=FI1-6.kHz =4kHz, IM3 = 46.kHz 14 OUT Noise Level NO versus Ambient Temperature Ta Test circuit, BW = 6.kHz OUT Output Level [dbuv IM3 NO [dbuv] RF IN Input Level [dbuv] Ambient Temperature Ta [ C] Ver

14 [ AMP CHARACTERISTICS] Ta = C, Circuit1, V + 1 = V + = 3.3V, IN = 4kHz, unless otherwise noted. Gain G / OUT Noise Level NO versus Gain Control Voltage GC IN Test circuit 1: G 1 Test circuit 4: NO, Bandwidth = 6.kHz 1 13 OUT Output Level versus IN Input Level G [db] NO G NO [dbuv] OUT Output Level [dbuv] GC IN = V GC IN = 1V GC IN = V GC IN =.V Gain Control Voltage GC IN [V] IN Input Level [dbuv] OUT Noise Level NO versus Gain G Gain G versus IN Input Frequency FI 1 Test circuit 4, BW = 6.kHz 1 GC IN = V 8 1 NO [dbuv] 6 4 G [db] GC IN = 1V GC IN = V GC IN =.V G [db] FI [MHz] Gain G versus Supply Voltage V+ Gain G versus Ambient Temperature Ta 1 1 GC IN = V 1 1 GC IN = V G [db] GC IN = 1V GC IN = V G [db] GC IN = 1V GC IN = V GC IN =.V V+ [V] GC IN =.V Ta [ C] Ver

15 [ CHARACTERISTICS] Ta = C, Circuit1, V + 1 = V + = 3.3V, IN = 4kHz, unless otherwise noted. Outpu Volage V versus IN Input Level. V [V] IN Input Level [dbuv] Output Voltage V versus Supply Voltage V+ Output Voltage V versus Ambient Temperature Ta. IN = 1dBuV. IN = 1dBuV IN = 8dBuV IN = 8dBuV V [V] 1. 1 IN = 6dBuV IN = 4dBuV V [V] 1. 1 IN = 6dBuV IN = 4dBuV. IN = dbuv IN = dbuv V+ [V] Ta [ C] [CAUTION] The specifications on this databook are only given for information, without any guarantee as regards either mistakes or omissions. The application circuits in this databook are described only to show representative usages of the product and not intended for the guarantee or permission of any right including the industrial rights. Ver