AD6121ARS Analog Devices, AD6121ARS Datasheet
AD6121ARS
Available stocks
Related parts for AD6121ARS
AD6121ARS Summary of contents
Page 1
CDMA INPUT FM INPUT INPUT STAGE CDMA/FM SELECT CDMA 3 V Receiver IF Subsystem with Integrated Voltage Regulator GENERAL DESCRIPTION The AD6121 is a low power receiver IF subsystem specifically designed for CDMA applications. It consists of high dynamic ...
Page 2
AD6121–SPECIFICATIONS Specification TOTAL GAIN Maximum Gain Minimum Gain IF AMPLIFIER CDMA and FM Input Noise Figure Input Third-Order Intercept Input 1 dB Compression Point Gain Flatness CDMA Input Capacitance CDMA Input Resistance FM Input Capacitance FM Input Resistance Output Capacitance ...
Page 3
... LDOB 14 LDOE Model AD6121ARS AD6121ARSRL AD6121ACP AD6121ACPRL CAUTION ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although the AD6121 features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high-energy electrostatic discharges ...
Page 4
AD6121 SSOP LPCC Pin Pin Number Number Pin Label Description 1 30 CDMA/FM Selects CDMA or FM Input 2 31 CDMAIPP CDMA “Positive” Input 3 32 CDMAIPN CDMA “Negative” Input IFGND IF Ground 5 3 FMIPP FM ...
Page 5
Test Figures 1:8 RF SOURCE 909 RF SOURCE 1:4 RF SOURCE 205 LO SOURCE ALL SIGNAL PATHS MUST BE EQUAL LENGTHS FOR I/Q MEASUREMENTS R & S SMT03 RF SYNC REFERENCE R & S SMT03 RF SYNC REFERENCE R & ...
Page 6
AD6121 REACTIVE NOISE CONJUGATE SOURCE MATCH 4kHz, 0.5V TO 2.5V 4kHz 2.7V Typical Performance Characteristics 60.00 40.00 20.00 0.00 –20. + – –40. + –60.00 0.5 ...
Page 7
–40. – –60.00 0.5 1 1.5 VGAIN – Volts ° ° ° 4.00 3.50 3.00 2. 1.50 1.00 0.50 0.00 0 ...
Page 8
AD6121 50. – 40. + 30.00 20.00 10.00 0. 100 150 FREQUENCY – MHz ° ° ° 60.00 VGAIN = +2.5V 40.00 20.00 0.00 VGAIN = +1.5V –20.00 –40.00 VGAIN ...
Page 9
IF = 210MHz IF = 85MHz 0.15 0.1 0. BASEBAND FREQUENCY – MHz 85MHz 210MHz – BASEBAND FREQUENCY – MHz 2.5 T ...
Page 10
... INPUT INPUT STAGE CDMA/FM SELECT X-AMP is a trademark of Analog Devices, Inc. amplifiers. The gain and input bandwidth of the AD6121 are identical for both the FM and CDMA operating modes. When the CDMA/FM pin is high, CDMA mode is enabled. When the pin is low, FM mode is enabled. ...
Page 11
AD6121 IFOPP L/2 2C PAR L/2 2C PAR IFOPN In order to confirm whether the pull-up inductors have been properly designed, sweep the IF frequency and view the output of the IF amplifiers on a spectrum analyzer. If the inductor ...
Page 12
AD6121 Power-Down Control The AD6121 can operate with the IF amplifier and I and Q demodulator stages both powered up, the IF amplifiers powered up alone or both the IF amplifiers and demodulator powered down. The AD6121 cannot operate with ...
Page 13
DIFFERENTIAL REFERRED TO 500 1.78mV p-p DIFFERENTIAL f = 85.38MHz –60dBm REFERRED TO 50 632.5mV p-p DIFFERENTIAL SIGNAL 1:8 GENERATOR 500 IN CDMA/FM CDMAIPN CDMAIPP IFGND FMIPN FMIPP IFVCC DGND LOIPP LOIPN DVCC ...
Page 14
AD6121 the header labeled PD2. As described in Table I of this data sheet invalid to have PD1 open circuited and PD2 short circuited. In order to power down the IF amplifiers and de- modulator, open circuit both ...
Page 15
10nF 0 1:8 0 CDMAIP 10nF 120nH 500 10nF 0 1:8 0 FMIP X13 X10 X11 X8 1k 150nH X16 ...
Page 16
AD6121 0.311 (7.9) 0.301 (7.64) 0.078 (1.98) 0.068 (1.73) 0.008 (0.203) 0.002 (0.050) 0.010 (0.25) REF OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 28-Lead Shrink Small Outline Package (SSOP) (RS-28) 0.407 (10.34) 0.397 (10.08 0.212 (5.38) 0.205 ...