VCA8500IRGCRG4 datasheet(4/40 Pages) TI

Part #	VCA8500IRGCRG4

Description	8-Channel, Ultralow-Power, Variable Gain Amplifier with Low-Noise Pre-Amp

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VCA8500

SBOS390A – JANUARY 2008 – REVISED MARCH 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, PG = 30dB, clamp disabled (CL = 1), LPF = 15MHz, and RLOAD = 1kΩ on each output to ground, unless

otherwise noted.

VCA8500

TEST

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

LEVEL(1)

ACCURACY

20, 25,

Gain (PGA)

Selectable through SPI™

dB

A

27, 30

Total gain, maximum

LNA + PGA gain, VCNTL = 1.2V

48

49.5

51

dB

A

Gain range

VCNTL = 0V to 1.2V

46

dB

A

Gain range

VCNTL = 0.1V to 1.0V

40

dB

A

Gain slope

VCNTL = 0.1V to 1.0V

44.4

dB/V

A

Gain error, absolute

0V < VCNTL < 0.1V

±0.5

dB

A

0.1V < VCNTL < 1.0V

–1.5

±0.5

+1.5

dB

A

1.0V < VCNTL < 1.2V

±0.5

dB

A

Gain matching

Channel-to-channel

±0.25

±0.5

dB

A

Output offset voltage

Differential

–25

±1

+25

mV

A

Single-ended(3)

–50

±25

+50

mV

A

Clamp level (VOUT)

CL = 0

1.7

VPP

A

CL = 1 (clamp disabled)

2.8

VPP

B

GAIN CONTROL INTERFACE

Input voltage range (VCNTL)

Gain range = 46dB

0 to 1.2

V

A

Input resistance

25

k

Ω

C

VCNTL= 0V to 1.2V step;

Response time

0.5

µs

B

to 90% signal level, VOUT = 1VPP

Gain control bandwidth

1.5

MHz

C

CW SIGNAL PATH

Output transconductance (V/I)

At VIN = 100mVPP

14

16.4

18

mA/V

A

At VIN = 200mVPP

14.5

mA/V

B

Dynamic CW output current, max

2.9

mAPP

B

Static CW output current (sink)

0.9

mA

B

Output common-mode voltage (VCM0)

Supplied externally

+2.5

V

B

Output compliance range

Symmetric around VCMO

±0.5

V

B

Output capacitance

10

pF

C

Output impedance

50

k

Ω

C

Input voltage noise, CW mode

At f = 2MHz

1.15

nV/

√Hz

B

Signal-dependent noise (RTO)

At 2kHz offset from 2MHz CW carrier

+2

dB

B

At 2kHz offset from 5MHz CW carrier

+2

dB

B

Summing of eight channels (all modes)

Output noise correlation factor

0.6

dB

B

[compared to ideal 0dB]

(3)

Deviation from ideal common-mode voltage (VCM = 1.65V).

4

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