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See Technical Specifications

VCA8617PAGT

8-Channel Variable Gain Amplifier

Manufacturer:

Texas Instruments, Inc
Mfr.Part #:

VCA8617PAGT
Datasheet:

VCA8617PAGT Datasheet (PDF)
Amplifier Type:

Variable Gain
Number of Circuits:

8
Output Type:

Differential
Slew Rate:

300V/µs
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VCA8617PAGT General Description

The VCA8617 is an 8-channel variable gain amplifier ideally suited to portable ultrasound applications. Excellent dynamic performance enables use in low-power, high-performance portable applications. Each channel consists of a 20dB gain Low-Noise pre-Amplifier (LNA) and a Variable Gain Amplifier (VGA). The differential outputs of the LNA can be switched through the 8x10 cross-point switch, which is programmable through the serial interface input port.

The output of the LNA is fed directly into the VGA stage. The VGA consists of two parts, a Voltage-Controlled Attenuator (VCA) and a Programmable Gain Amplifier (PGA). The gain and gain range of the PGA can be digitally configured separately. The gain of the PGA can vary between four discrete settings of 25dB, 30dB, 35dB, and 40dB. The VCA has four programmable maximum attenuation settings: 29dB, 33dB, 36.5dB, and 40dB. Also, the VCA can be continuously varied by a control voltage from 0dB to a maximum of 29dB, 33dB, 36.5dB, and 40dB.

The output of the PGA feeds directly into an integrated low-pass filter.

Key Features

3V OPERATION
LOW INPUT NOISE:
- 1.05nV/√Hz at f_IN = 5MHz
EXTREMELY LOW POWER OPERATION:
- 103mW/CHANNEL
INTEGRATED LOW-PASS, ANTI-ALIASING BUTTERWORTH FILTER
- 14.5MHz BANDWIDTH
INTEGRATED INPUT CLAMP DIODES
DIFFERENTIAL OUTPUT
INTEGRATED INPUT LNA
READABLE CONTROL REGISTERS
INTEGRATED CONTINUOUS WAVE (CW) PROCESSOR

Specifications

Category	Integrated Circuits (ICs)LinearAmplifiersInstrumentation, OP Amps, Buffer Amps	Series	-
Amplifier Type	Variable Gain	Number of Circuits	8
Output Type	Differential	Slew Rate	300V/µs
Gain Bandwidth Product	100 MHz	Current - Input Bias	1 nA
Current - Supply	-	Voltage - Supply Span (Min)	2.85 V
Voltage - Supply Span (Max)	3.15 V	Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount	Base Product Number	VCA8617