The PGA308 is a programmable analog sensor signal conditioner. The analog signal path amplifies the sensor signal and provides digital calibration for offset and gain. Calibration is done via the 1W pin, a digital One-Wire, UART-compatible interface. For three-terminal sensor modules, 1W may be connected to VOUT and the assembly programmed through the VOUT pin. Gain and offset calibration parameters are stored onboard in seven banks of one-time programmable (OTP) memory. The power-on reset (POR) OTP bank may be programmed a total of four times.
The all-analog signal path contains a 2×2 input multiplexer (mux) to allow electronic sensor lead swapping, a coarse offset adjust, an auto-zero programmable gain instrumentation amplifier (PGA), a fine gain adjust, a fine offset adjust, and a programmable gain output amplifier. Fault monitor circuitry detects and signals sensor burnout, overload, and system fault conditions. Over/under-scale limits provide additional means for system level diagnostics. The dual-use DOUT/VCLAMP pin can be used as a programmable digital output or as a VOUT over-voltage clamp.
For detailed application information, see the PGA308 User's Guide (SBOU069) available for download at www.ti.com.
|Part number||Order||PGA/VGA||Number of channels (#)||Vs (Min) (V)||Vs (Max) (V)||Slew rate (Typ) (V/us)||Operating temperature range (C)||Package Group||Package size: mm2:W x L (PKG)|
||PGA||2||2.7||5.5||0.6||-40 to 125||
VSON | 10
VSSOP | 10
10VSON: 12 mm2: 3 x 4 (VSON | 10)
10VSSOP: 9 mm2: 3 x 3 (VSSOP | 10)