PGA309_11 Datasheet, PDF (7/24 Pages) Texas Instruments – Voltage Output Programmable Sensor Conditioner

PGA309
www.ti.com
SBOS292C – DECEMBER 2003 – REVISED JANUARY 2011
ELECTRICAL CHARACTERISTICS (continued)
Boldface limits apply over the specified temperature range, T_A = –40°C to +125°C.
At T_A = +25°C, V_SA= V_SD = +5V (V_SA = V_{SUPPLY ANALOG}, V_SD = V_{SUPPLY DIGITAL}; V_SA must equal V_SD), GND_D = GND_A = 0, and V_REF
= REF_IN/REF_OUT = +5V, unless otherwise noted.
PGA309
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNIT
Linearization Adjust and Excitation Voltage (V_EXC)
Range 0
Register 3, bit D11 = 0
xx Linearization DAC Range
xx Linearization DAC Resolution
With respect to V_FB
±127 steps, 7-bit + sign
−0.166 to +0.166
1.307
V/V
mV/V
xx V_EXC Gain
xx Gain Error Drift
With respect to V_REF
0.83
V/V
25
ppm/°C
Range 1
Register 3, bit D11 = 1
xx Linearization DAC Range
xx Linearization DAC Resolution
With respect to V_FB
±127 steps, 7-bit + sign
−0.124 to +0.124
0.9764
V/V
mV/V
xx V_EXC Gain
xx Gain Error Drift
With respect to V_REF
0.52
V/V
25
ppm/°C
V_EXC Range Upper Limit
I_{EXC SHORT}
Digital Interface
I_EXC = 5mA
Short-circuit V_EXC output current
V_SA −0.5
V
50
mA
Two-Wire Compatible
Bus speed
1
400
kHz
One-Wire
Serial speed baud rate
4.8K
38.4K
Bits/s
Maximum Lookup Table Size⁽⁷⁾
17 x 3 x 16
Bits
Two-Wire Data Rate
PGA309 to EEPROM (SCL frequency)
65
kHz
Logic Levels
Input Levels (SDA, SCL, PRG, TEST)
Input Levels (SDA, SCL, PRG, TEST)
Input Levels (SDA, SCL)
Pull-Up Current Source (SDA, SCL)
Low
High
Hysteresis
0.2 • V_SD
V
0.7 • V_SD
V
0.1 • V_SD
V
55
85
125
mA
Pull-Down Current Source (TEST)
15
25
40
mA
Output LOW Level (SDA, SCL, PRG)
Power Supply
Open drain, I_SINK = 5mA
0.4
V
V_SA, V_SD
I_SA + I_SD, Quiescent Current
Power-On Reset (POR)
V_SA = V_SD = +5V, without bridge load
2.7
5.5
V
1.2
1.6
mA
Power-Up Threshold
Power-Down Threshold
Temperature Range
V_S rising
V_S falling
2.2
2.7
V
1.7
V
Specified Performance Range
–40
+125
°C
Operational-Degraded Performance Range
–55
+150
°C
(7) Lookup table allows multislope compensation over temperature. Lookup table has access to 17 calibration points consisting of three
adjustment values (Tx, Temperature, ZMx, Zero DAC, GMx, Gain DAC) that are stored in 16-bit data format (17x3x16 = Lookup table
size).
Copyright © 2003–2011, Texas Instruments Incorporated
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