Datasheet

PGA308
www.ti.com SBOS440B –JULY 2008–REVISED DECEMBER 2010
ELECTRICAL CHARACTERISTICS (continued)
Boldface limits apply over the specified temperature range, T
A
= –40°C to +125°C.
At T
A
= +25°C, V
S
= +5V, GND = 0V, D
OUT
/V
CLAMP
= +5V, and V
REF
= +5V, unless otherwise noted.
PGA308
PARAMETER CONDITIONS MIN TYP MAX UNIT
Over- and Under-Scale Limits
Over-Scale Thresholds V
LIM
= 4V, register-selectable ratio of V
LIM
OS0 HL[2:0] (CFG1 register D[5:3]) = 000 0.97 0.9805 0.99 V/V
OS1 HL[2:0] (CFG1 register D[5:3]) = 001 0.9588 0.9688 0.9788 V/V
OS2 HL[2:0] (CFG1 register D[5:3]) = 010 0.9509 0.9609 0.9709 V/V
OS3 HL[2:0] (CFG1 register D[5:3]) = 011 0.9392 0.9492 0.9492 V/V
OS4 HL[2:0] (CFG1 register D[5:3]) = 100 0.8416 0.8516 0.8616 V/V
OS5 HL[2:0] (CFG1 register D[5:3]) = 101 0.7673 0.7773 0.7873 V/V
OS6 HL[2:0] (CFG1 register D[5:3]) = 110 0.6189 0.6289 0.6389 V/V
OS7 HL[2:0] (CFG1 register D[5:3]) = 111 0.5603 0.5703 0.5803 V/V
Over-Scale Threshold Tempco ±3 ppm/°C
Over-Scale Amplifier Offset ±9 mV
Over-Scale Amplifier Offset Drift ±10 mV/°C
Under-Scale Thresholds V
LIM
= 5V, register-selectable ratio of V
LIM
US7 LL[2:0] (CFG1 register D[2:0]) = 111 0.0487 0.0547 0.0607 V/V
US6 LL[2:0] (CFG1 register D[2:0]) = 110 0.04478 0.05078 0.05678 V/V
US5 LL[2:0] (CFG1 register D[2:0]) = 101 0.04088 0.04688 0.05288 V/V
US4 LL[2:0] (CFG1 register D[2:0]) = 100 0.03306 0.03906 0.04506 V/V
US3 LL[2:0] (CFG1 register D[2:0]) = 011 0.02916 0.03516 0.04116 V/V
US2 LL[2:0] (CFG1 register D[2:0]) = 010 0.02525 0.03125 0.03725 V/V
US1 LL[2:0] (CFG1 register D[2:0]) = 001 0.01743 0.02343 0.02943 V/V
US0 LL[2:0] (CFG1 register D[2:0]) = 000 0.01353 0.01953 0.02553 V/V
Under-Scale Threshold Tempco ±3 ppm/°C
Under-Scale Amplifier Offset ±9 mV
Under-Scale Amplifier Offset Drift ±10 mV/°C
Output Voltage Clamp
Input Voltage Range V
CLAMP
≤ V
S
, V
S
= +5V 1.25 4.95 V
Input Bias Current ±60 nA
V
OUT
Clamp Point V
CLAMP
– 0.05 V
CLAMP
V
CLAMP
+ 0.05 V
Fault Monitor Circuit
(External Comparators)
INP_HI Comparator Threshold Fault Detect Mode Select = 0 (bridge fault); see CFG1 Smaller of (V
S
– 1.2) or (0.65V
FLT
) V
INN_HI Comparator Threshold register
INP_LO Comparator Threshold Fault Detect Mode Select = 0 (bridge fault); see CFG1 Larger of (0.1V) or (0.35V
FLT
) V
INN_LO Comparator Threshold register
Fault Monitor Reference V
FLT
Fault Monitor Reference; see CFG1 register, FLT REF bit V
S
or V
REF
V
sets V
FLT
INP_HI Comparator Threshold Fault Detect Mode Select = 1 (common-mode fault); see V
S
– 1.2 V
INN_HI Comparator Threshold CFG1 register
INP_LO Comparator Threshold Fault Detect Mode Select = 1 (common-mode fault); see 70 100 130 mV
INN_LO Comparator Threshold CFG1 register
Comparator Hysteresis 7 mV
Comparator Input Offset Voltage ±10 mV
Fault Monitor Circuit
(Internal Comparators)
A1SAT_LO Comparator Threshold Threshold is amplifier negative saturation voltage 100 mV
A2SAT_LO Comparator Threshold
A1SAT_HI Comparator Threshold Threshold is amplifier positive saturation voltage V
S
– 0.12 V
A2SAT_HI Comparator Threshold
A3SAT_LO Comparator Threshold Threshold is amplifier negative saturation voltage 50 mV
V
IN1
, V
IN2
Pull-up Current Sources
Pull-Up Current Source I
PU
Register-selectable 15 30 45 nA
Current Source Matching ±1.5 ±7 nA
Current Source Tempco ±5 pA/°C
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