Introduction to PGAs and VGAs chip
A PGAs and VGAs chip is an amplifier chip that allows for discrete or continuous gain adjustment via digital control signals. These chips integrate gain-switching circuitry, a control interface, and the core amplification unit. Signal gain can be rapidly altered by sending commands from a digital controller-eliminating the need for manual hardware adjustments-thereby meeting the amplification requirements for input signals of varying amplitudes.
Variable gain amplifiers (VGAs) fall under the category of adjustable-gain amplifiers. VGAs utilize analog control signals for continuous gain adjustment; unlike the discrete gain steps found in PGAs, most VGAs offer smooth, continuous gain variation. However, the integration of digital control interfaces in modern VGAs has blurred the distinction between them and PGAs. Consequently, these two types of chips are often grouped together and collectively referred to as "programmable/variable gain amplifiers."
Introduction to Specific Models of PGAs and VGAs chip
The PGA854 is a wide-bandwidth, high-voltage, low-noise programmable gain instrumentation amplifier featuring differential outputs. PGAs and VGAs chip offers eight decimal gain settings, ranging from an attenuation gain of 0.5 V/V to a maximum gain of 100 V/V. Gain settings are configured using three digital gain-selection pins.
Its architecture is optimized to drive the inputs of high-resolution, precision analog-to-digital converters (ADCs) with sampling rates up to 1 MSPS, eliminating the need for a separate ADC driver. The output stage power supply is decoupled from the input stage, protecting the ADC or downstream components from damage caused by overdrive.
Super-beta input transistors provide ultra-low input bias current-and consequently, ultra-low input current noise density-making the device a versatile choice for virtually any sensor type. Its low-noise, current-feedback front-end architecture ensures excellent gain flatness even at high frequencies, making it an outstanding device for high-impedance sensor readout. Integrated protection circuitry on the input pins handles overvoltage conditions extending up to ±40 V beyond the supply rails.
PGAs and VGAs chip Parameters
|
PGA/VGA |
PGA |
|
Number of channels |
1 |
|
Vs (min) (V) |
9 |
|
Vs (max) (V) |
36 |
|
Input type |
Differential |
|
Output type |
Differential |
|
Input offset drift (±) (typ) (µV/°C) |
0.3 |
|
Interface type |
GPIO |
|
BW at Acl (MHz) |
8 |
|
Acl, min spec gain (V/V) |
0.5 |
|
Gain (max) (dB) |
100 |
|
Architecture |
Bipolar |
|
Features |
Fully Differential, Overvoltage protection, Super-beta |
|
Vos (offset voltage at 25°C) (typ) (mV) |
0.05 |
|
Input voltage noise (typ) (µV√Hz) |
0.034 |
|
Slew rate (typ) (V/µs) |
35 |
|
Iq per channel (typ) (mA) |
5.2 |
|
Gain error (typ) (%) |
0.01 |
|
Gain drift (max) (ppm/°C) |
2 |
|
Rating |
Catalog |
|
Operating temperature range (°C) |
-40 to 125 |
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