Datasheet
1
2
3
4
5
10
9
8
7
6
V
REF
V
OUT
V
FB
V
SJ
V
IN2
D /V
OUT CLAMP
1W
GND
V
S
V
IN1
PGA308
1
2
3
4
5
10
9
8
7
6
V
REF
V
OUT
V
FB
V
SJ
V
IN2
D /V
OUT CLAMP
1W
GND
V
S
V
IN1
PGA308
PGA308
SBOS440B –JULY 2008–REVISED DECEMBER 2010
www.ti.com
PIN CONFIGURATIONS
DGS PACKAGE
DRK PACKAGE
MSOP-10
3x4 DFN-10
(TOP VIEW)
(TOP VIEW)
PIN DESCRIPTIONS
PIN # NAME DESCRIPTION
Dual-use pin: Output voltage clamp limit for V
OUT
or programmable digital output. The output voltage
clamp function is for use in multiple supply systems where the PGA308 may be at V
S
= +5V and the
system analog-to-digital converter (ADC) is powered at +3V. Setting V
CLAMP
to +3.2V prevents
1 D
OUT
/V
CLAMP
over-voltage and latch-up on the system ADC input. V
CLAMP
may be set through a resistor divider from
V
S
. If configured for digital output, the D
OUT
function allows for configuration plus calibration of a sensor
module either through the One-Wire interface (1W pin) or as a permanently configured module through
the power-on reset (POR) OTP memory setting.
One-Wire interface program pin. UART interface for digital calibration of the PGA308 over a single
2 1W
wire. Can be connected to V
OUT
for a three terminal (V
S
, GND, V
OUT
) programmable sensor assembly.
3 GND Ground.
4 V
S
+Voltage supply.
Signal input voltage 1. Connect to + or – output of the sensor bridge. Internal multiplexer can change
5 V
IN1
connection internally to front-end PGA.
Signal input voltage 2. Connect to + or – output of the sensor bridge. Internal multiplexer can change
6 V
IN2
connection internally to front-end PGA.
Output amplifier summing junction. Use for output amplifier compensation when driving large capacitive
7 V
SJ
loads (> 200pF) and/or for using external gain setting resistors for the output amplifier.
V
OUT
feedback pin. Voltage feedback sense point for over-/under-scale limit circuitry. If internal gain set
resistors for the output amplifier are used, this pin is also the voltage feedback sense point for the
8 V
FB
output amplifier. V
FB
in combination with V
SJ
allows for use of external filter and protection circuits
without degrading the PGA308 V
OUT
accuracy. V
FB
must always be connected to either V
OUT
or the
point of feedback for V
OUT
if external filtering is used.
9 V
OUT
Analog output voltage of conditioned sensor.
Reference voltage input pin. V
REF
is used for coarse offset adjust and Zero DAC. V
REF
or V
S
may be
10 V
REF
individually selected for over-/under-scale threshold reference and fault monitor comparator reference.
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