Datasheet

PGA280
SBOS487A –JUNE 2009–REVISED SEPTEMBER 2009................................................................................................................................................ www.ti.com
ELECTRICAL CHARACTERISTICS (continued)
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
GAIN Output Swing: ±4.5V
(5)
Range of Input Gain ⅛ to 128 V/V
Range of Output Gain: 1V/V and 1⅜ 1 and 1⅜ V/V
Gain Error, All Binary Steps All Gains ±0.03 ±0.15 %
vs Temperature
(6) (7)
No Load, All Gains Except G = 128V/V -0.5 ±2 ppm/°C
No Load, G = 128V/V -1 ±3 ppm/°C
Gain Step Matching
(8)
(Gain to gain) No Load, All Gains See Typical Characteristics
Nonlinearity No Load, All Gains
(9)
1.5 10 ppm
Over Temperature
(6)
No Load, All Gains 3 ppm
OUTPUT
Voltage Output Swing from Rail
(8)
VSOP = 5V, Load Current 2mA 40 100 mV
VSOP = 2.7V, Load Current 1.5mA 100 mV
Capacitive Load Drive 500 pF
Short-Circuit Current I
SC
To VSOP/2, Gain = 1.375V/V 7 15 25 mA
Output Resistance Each output VOP and VON 200 mΩ
(VSON) + (VSOP) –
VOLTAGE RANGE FOR VOCM VSP–2V > VOCM V
0.1 0.1
Bias Current into VOCM I
B
3 100 nA
VOCM Input Resistance 1 GΩ
INTERNAL OSCILLATOR
Frequency of Internal Clock
(6) (8)
0.8 1 1.2 MHz
Ext. Oscillator Frequency Range 0.8 1 1.2 MHz
FREQUENCY RESPONSE
Gain Bandwidth Product
(8)
GBP G > 4 6 MHz
Slew Rate
(8)
, 4V
PP
Output Step SR G = 1, C
L
= 100pF, BUF On 1 V/μs
G = 8, C
L
= 100pF 2 V/μs
G = 128, C
L
= 100pF 1 V/μs
Settling Time
(8)
t
S
0.01% G = 8, V
O
= 8V
PP
Step 20 μs
0.001% G = 8, V
O
= 8V
PP
Step 30 μs
0.01% G = 128, V
O
= 8V
PP
Step 40 μs
0.001% G = 128, V
O
= 8V
PP
Step 40 μs
Overload Recovery, Input
(8)
0.5V Over Supply, G = ⅛ to 128 8 μs
Overload Recovery, Output
(8)
±5.5V
P
Input, G = 1V/V 6 μs
INPUT MULTIPLEXER (Two-Channel)
Crosstalk, INP1 to INP2 At dc; Gain = 128V/V < –130 dB
Series-Resistance
(8)
—see Figure 44 600 Ω
Switch On-Resistance
(8)
450 Ω
Current Source and Sink
(8)
To GND 70 95 125 μA
INPUT CURRENT BUFFER (BUF)
Offset Voltage
(8)
V
OS
Buffer Active 15 mV
(5) Gains smaller than ½ are measured with smaller output swing.
(6) Specified by design; not production tested.
(7) See Figure 10 for typical gain error drift of various gain settings.
(8) See Application Information section and typical characteristic graphs.
(9) Only G = 1 is production tested.
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