8-Channel Variable Gain Amplifier

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 By Texas Instruments
Part Manufacturer Description Datasheet Samples
VCA8617PAGT Texas Instruments 8-Channel Variable Gain Amplifier 64-TQFP -40 to 85
VCA8617PAGTG4 Texas Instruments 8-Channel Variable Gain Amplifier 64-TQFP -40 to 85
VCA8617PAGR Texas Instruments 8-Channel Variable Gain Amplifier 64-TQFP -40 to 85
VCA8617PAGRG4 Texas Instruments SPECIALTY ANALOG CIRCUIT, PQFP64, GREEN, PLASTIC, TQFP-64
VCA8617 's PackagesVCA8617 's pdf datasheet
VCA8617PAGR TQFP
VCA8617PAGRG4 TQFP
VCA8617PAGT TQFP
VCA8617PAGTG4 TQFP




VCA8617 Pinout, Pinouts
VCA8617 pinout,Pin out
This is one package pinout of VCA8617,If you need more pinouts please download VCA8617's pdf datasheet.

VCA8617 Application circuits
VCA8617 circuits
This is one application circuit of VCA8617,If you need more circuits,please download VCA8617's pdf datasheet.


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