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VCA8500 Datasheet(PDF) 4 Page - Texas Instruments |
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VCA8500 Datasheet(HTML) 4 Page - Texas Instruments |
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4 / 15 page  www.ti.com VCA8500 SBOS390 – JANUARY 2008 ELECTRICAL CHARACTERISTICS (continued) All specifications at TA = +25°C, AVDD2 = 5.0V, AVDD1 = DVDD = 3.3V; single-ended, ac-coupled (≤ 1µF) input configuration to the preamp (LNA), fIN = 5MHz, VCNTL = 1.0V, VCA output is 2VPP differential, RLOAD = 1kΩ on each output to ground, unless otherwise noted. VCA8500 TEST PARAMETER TEST CONDITIONS MIN TYP MAX UNIT LEVEL(1) CW SIGNAL PATH Output transconductance (V/I) 15 mA/V IOUT-CW Dynamic CW output current Signal current 2.4 (±1.2) mAPP IOUT-DC Static CW output current 0.9 mA VCMO Output common-mode voltage 2.5 VDC VCout Output compliance range Symmetric around VCMO TBD ±0.5 TBD V COUT Output capacitance < 10 pF ZOUT Output impedance 50 k Ω HD2 TBD dBc THDCW Harmonic distortion HD3 TBD dBc eN, RTI Input voltage noise, CW mode At f = 2MHz 1.1 nV/ √Hz At 2kHz offset from Signal-dependent noise (RTO) +2 dB 2MHz CW carrier At 2kHz offset from +2 dB 5MHz CW carrier Summing of eight channels Output noise correlation factor 0.6 dB [compared to ideal 0dB (SNR)] FILTER LPF Low-pass filter (second-order) –3dB point, VCNTL = 1.2V 10 MHz Tolerance ±10 ±15 % Group delay (variation) TBD ns Gain flatness –1dB point TBD MHz HPF High-pass filter (first-order, due to –3dB point, VCNTL = 1.2V 150 kHz internal ac coupling) ACCURACY Gain error (VCA)(3) VCNTL = 0V to 1.2V ±0.25 ±0.5 dB Gain range VCNTL = 0V to 1.2V TBD 45 TBD dB Gain slope VCNTL = 0V to 1.2V 37.5 dB/V Gain matching, channel-to-channel VCNTL = 0V to 1.2V ±0.5 ±1.5 dB 20, 25, 27, Gain, PGA Selectable through SDI dB 30 VOS Output offset voltage tab Differential –25 ±5 +25 mV tab Common-mode –50 ±25 +50 mV GAIN CONTROL INTERFACE VCNTL Input voltage range Gain range = 45dB 0 to 1.2 V Input resistance 25 k Ω Response time 0.75 µs VCNTL= 0V to 1.2V step; Gain control bandwidth 1.5 MHz to 90% Signal Level DIGITAL INPUTS (SDI)(4)(5) (PD, DIN, DOUT, CLK, RST) VIH VIH, High-level input voltage 2.0 VD V VIL VIL, Low-level input voltage 0 0.8 V IIN Input current ±10 µA fCLK Clock frequency 10k 20M Hz Input resistance 1 M Ω Input capacitance 5 pF (3) Compared to a standard curve. This is also Gain Error vs VCONTROL. (4) Parameters ensured by design; not production tested. (5) Internal pull-up/pull-down resistors. 4 Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): VCA8500 |
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