Datasheet
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 With respect to V
FB
−0.166 to +0.166 V/V
xx Linearization DAC Resolution ±127 steps, 7-bit + sign 1.307 mV/V
xx V
EXC
Gain With respect to V
REF
0.83 V/V
xx Gain Error Drift 25 ppm/°C
Range 1 Register 3, bit D11 = 1
xx Linearization DAC Range With respect to V
FB
−0.124 to +0.124 V/V
xx Linearization DAC Resolution ±127 steps, 7-bit + sign 0.9764 mV/V
xx V
EXC
Gain With respect to V
REF
0.52 V/V
xx Gain Error Drift 25 ppm/°C
V
EXC
Range Upper Limit I
EXC
= 5mA V
SA
−0.5 V
I
EXC SHORT
Short-circuit V
EXC
output current 50 mA
Digital Interface
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) Low 0.2 • V
SD
V
Input Levels (SDA, SCL, PRG, TEST) High 0.7 • V
SD
V
Input Levels (SDA, SCL) Hysteresis 0.1 • V
SD
V
Pull-Up Current Source (SDA, SCL) 55 85 125 mA
Pull-Down Current Source (TEST) 15 25 40 mA
Output LOW Level (SDA, SCL, PRG) Open drain, I
SINK
= 5mA 0.4 V
Power Supply
V
SA,
V
SD
2.7 5.5 V
I
SA
+ I
SD
, Quiescent Current V
SA
= V
SD
= +5V, without bridge load 1.2 1.6 mA
Power-On Reset (POR)
Power-Up Threshold V
S
rising 2.2 2.7 V
Power-Down Threshold V
S
falling 1.7 V
Temperature Range
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).
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