Datasheet

PGA280
www.ti.com ................................................................................................................................................ SBOS487A –JUNE 2009–REVISED SEPTEMBER 2009
ELECTRICAL CHARACTERISTICS
Boldface limits apply over the specified temperature range, T
A
= –40°C to +105°C.
At T
A
= +25°C, VSP = +15V, VSN = –15V, VSON = 0V, VSOP = 5V, DVDD = +3V, DGND = 0V, R
L
= 2.5kΩ to VSOP/2 =
VOCM, G = 1V/V, using internal clock, BUF inactive, V
CM
= 0V, and differential input and output, unless otherwise noted.
PGA280
PARAMETER CONDITIONS MIN TYP MAX UNIT
INPUT
Offset Voltage, RTI
(1)
V
OS
Gain = 1V/V, 1.375V/V ±50 ±250 μV
Gain = 128V/V ±3 ±15 μV
vs Temperature
(2)
dV
OS
/dT Gain = 1V/V ±0.2 ±0.6 μV/°C
Gain = 128V/V ±0.03 ±0.17 μV/°C
VSP – VSN = 10 and 36V,
vs Power Supply, RTI PSR ±0.3 ±3 μV/V
Gain = 1V/V, 128V/V
vs External Clock, RTI
(3)
dV
OS
/df 0.8MHz to 1.2MHz, Gain = 1V/V ±0.05 μV/kHz
0.8MHz to 1.2MHz, Gain = 128V/V ±0.001 μV/kHz
Long-Term Stability
(4)
Gain=128 3.5 nV/month
Input Impedance Single-ended and Differential >1 GΩ
Input Capacitance, IN1 / IN2 Single-ended 12 / 8 pF
Input Voltage Range Gain = 1V/V, Gain = 128V/V (VSN) + 2.5 (VSP) – 2.5 V
Common-Mode Rejection, RTI CMR Gain = 1V/V ±0.3 ±3 μV/V
Gain = 128V/V ±0.08 ±0.8 μV/V
Over Temperature Gain = 128V/V ±0.1 ±1.5 μV/V
SINGLE-ENDED OUTPUT
CONNECTION
Offset Voltage, RTI, SE Out V
OS
Gain = 1V/V, 1.375V/V, SE ±120 μV
Gain = 128V/V, SE ±3 μV
vs Temperature, SE Out dV
OS
/dT Gain = 1V/V, SE 0.6 μV/°C
Gain = 64V/V, SE 0.05 μV/°C
INPUT BIAS CURRENT
(3)
Bias Current I
B
Gain = 1V/V ±0.3 ±1 nA
Gain = 128V/V ±0.8 ±2 nA
Over Temperature I
B
Gain = 1V/V, Gain = 128V/V ±0.6 ±2 nA
Offset Current I
OS
Gain = 1V/V, Gain = 128V/V ±0.1 ±0.5 nA
Over Temperature I
OS
Gain = 1V/V, Gain = 128V/V ±0.9 ±2 nA
NOISE
Voltage Noise, RTI; Target e
NI
f = 0.01Hz to 10Hz R
S
= 0Ω, G = 128 420 nV
PP
f = 1kHz R
S
= 0Ω, G = 128 22 nV/√Hz
f = 0.01Hz to 10Hz R
S
= 0Ω, G = 1 4.5 μV
PP
f = 1kHz R
S
= 0Ω, G = 1 240 nV/√Hz
Current Noise, RTI I
N
f = 0.01Hz to 10Hz R
S
= 10MΩ, G = 128 1.7 pA
PP
f = 1kHz R
S
= 10MΩ, G = 128 90 fA/√Hz
(1) RTI: Referred to input.
(2) Specified by design; not production tested.
(3) See Application Information section and typical characteristic graphs.
(4) 300-hour life test at +150°C demonstrated randomly distributed variation in the range of measurement limits.
Copyright © 2009, Texas Instruments Incorporated Submit Documentation Feedback 3
Product Folder Link(s): PGA280