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| AMC7812B_14 Datasheet, PDF (4/93 Pages) Texas Instruments – 12-Bit Analog Monitoring and Control Solution with Multichannel ADC, DACs, and Temperature Sensors | |||
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AMC7812B
SBAS625A â SEPTEMBER 2013 â REVISED SEPTEMBER 2013
www.ti.com
ELECTRICAL CHARACTERISTICS (continued)
At TA = â40°C to +105°C, AVDD = DVDD = 4.5 V to 5.5 V, AVCC = +15 V, AGND = DGND = 0 V, IOVDD = 2.7 V to 5.5 V,
internal 2.5-V reference, and the DAC output span = 0 V to 5 V, unless otherwise noted.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX UNIT
INTERNAL REFERENCE
Output voltage
Output impedance
TA = +25°C, REF-OUT pin
2.495
2.5
2.505
V
0.4
Ω
Reference temperature coefficient
Output current (sourcing and sinking)
TA = â40°C to +125°C
10
25 ppm/°C
±5
mA
Output voltage noise
ADC PERFORMANCE
TA = +25°C, f = 1 kHz
f = 0.1 Hz to 10 Hz
260
nV/âHz
13
µVPP
ADC DC ACCURACY (for AVDD = 5 V)
Resolution
12
Bits
INL
Integral nonlinearity
DNL
Differential nonlinearity
Single-Ended Mode
TA = â40°C to +125°C
TA = â40°C to +125°C
±0.5
±1 LSB
±0.5
±1 LSB
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
Gain error
Gain error match
External reference, 0 V to (2 Ã VREF) mode,
VCM = 2.5 V
External reference, 0 V to VREF mode,
VCM = 1.25 V
±2
±5 LSB
±1
±5 LSB
±0.5
LSB
Zero code error
Zero code error match
0 V to (2 Ã VREF) mode, VCM = 2.5 V
External reference, 0 V to VREF mode,
VCM = 1.25 V
±1
±3 LSB
±1
±3 LSB
±0.5
LSB
Common-mode rejection
SAMPLING DYNAMICS
At dc, 0 V to (2 Ã VREF) mode
67
dB
Conversion rate
Conversion time(3)
Autocycle update rate(3)
External single analog channel, auto mode
External single analog channel, direct mode
External single analog channel
All 16 single-ended inputs enabled
500
kSPS
167
kSPS
2
µs
32
µs
Throughput rate
ANALOG INPUT(4)
SPI clock, 12 MHz or greater, single channel
500 kSPS
Full-scale input voltage
Absolute input voltage
Input capacitance(3)
DC input leakage current
TA = â40°C to +125°C, single-ended, 0 V to VREF
TA = â40°C to +125°C, single-ended,
0 V to (2 Ã VREF)
TA = â40°C to +125°C, VIN+ â VINâ, fully-differential,
0 V to VREF
TA = â40°C to +125°C, VIN+ â VINâ, fully-differential,
0 V to (2 Ã VREF)
TA = â40°C to +125°C
0 V to VREF mode
0 V to (2 Ã VREF) mode
Unselected ADC input
0
0
âVREF
â2 Ã VREF
GND â 0.2
VREF
V
2 Ã VREF
V
+VREF
V
2 Ã VREF
V
AVDD + 0.2
V
118
pF
73
pF
±10
µA
ADC REFERENCE INPUT
Reference input voltage range
Input current
TA = â40°C to +125°C
VREF = 2.5 V
1.2
AVDD
V
145
µA
(3) Sampled during initial release to ensure compliance; not subject to production testing.
(4) VIN+ or VINâ must remain within GND â 0.2 V and AVDD + 0.2 V; see the Analog Inputs section.
4
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