Datasheet

AMC7812
SBAS513E –JANUARY 2011–REVISED SEPTEMBER 2013 www.ti.com
ELECTRICAL CHARACTERISTICS (continued)
At T
A
= –40°C to +105°C, AV
DD
= DV
DD
= 4.5V to 5.5V, AV
CC
= +15V, AGND = DGND = 0V, IOV
DD
= 2.7V to 5.5V, internal
2.5V reference, and the DAC output span = 0V to 5V, unless otherwise noted.
AMC7812
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
INTERNAL REFERENCE
Output voltage T
A
= +25°C, REF-OUT pin 2.495 2.5 2.505 V
Output impedance 0.4 Ω
Reference temperature coefficient 10 25 ppm/°C
Output current (sourcing/sinking) ±5 mA
T
A
= +25°C, f = 1kHz 260 nV/√Hz
Output voltage noise
f = 0.1Hz to 10Hz 13 µV
PP
ADC PERFORMANCE
ADC DC ACCURACY (for AV
DD
= 5V)
Resolution 12 Bits
INL Integral nonlinearity ±0.5 ±1 LSB
DNL Differential nonlinearity ±0.5 ±1 LSB
Single-Ended Mode
Offset error ±1 ±3 LSB
Offset error match ±0.4 LSB
Gain error External reference ±1 ±5 LSB
Gain error match ±0.4 LSB
Differential Mode
External reference, 0V to (2 · V
REF
) mode, V
CM
=
±2 ±5 LSB
2.5V
Gain error
External reference, 0V to V
REF
mode,
±1 ±5 LSB
V
CM
= 1.25V
Gain error match ±0.5 LSB
0V to (2 · V
REF
) mode, V
CM
= 2.5V ±1 ±3 LSB
Zero code error
External reference, 0V to V
REF
mode,
±1 ±3 LSB
V
CM
= 1.25V
Zero code error match ±0.5 LSB
Common mode rejection DC, 0V to (2 · V
REF
) mode 67 dB
SAMPLING DYNAMICS
External single analog channel, auto mode 500 kSPS
Conversion rate
External single analog channel, direct mode 167 kSPS
Conversion time
(4)
External single analog channel 2 µs
Autocycle update rate
(4)
All 16 single-ended inputs enabled 32 µs
Throughput rate SPI clock 12MHz or greater, single channel 500 kSPS
ANALOG INPUT
(5)
Single-ended, 0V to V
REF
0 V
REF
V
Single-ended, 0V to (2 · V
REF
) 0 2 · V
REF
V
Full-scale input voltage
V
IN+
– V
IN-
, fully-differential, 0V to V
REF
–V
REF
+V
REF
V
V
IN+
– V
IN-
, fully-differential, 0V to (2 · V
REF
) –2 · V
REF
2 · V
REF
V
Absolute input voltage GND - 0.2 AV
DD
+ 0.2 V
0V to VREF mode 118
Input capacitance
(4)
pF
0V to (2 · VREF) mode 73
DC input leakage current Unselected ADC input ±10 µA
(4) Sampled during initial release to ensure compliance; not subject to production testing.
(5) V
IN+
or V
IN–
must remain within GND - 0.2V and AV
DD
+ 0.2V. See Analog Inputs section.
4 Submit Documentation Feedback Copyright © 2011–2013, Texas Instruments Incorporated
Product Folder Links: AMC7812