Datasheet

AMC7823
www.ti.com SLAS453F –APRIL 2005–REVISED MARCH 2012
ELECTRICAL CHARACTERISTICS: +5V
At –40°C to +85°C, AV
DD
= 5V, DV
DD
= 5V, BV
DD
= 3V to 5V, using external 2.5V reference, unless otherwise noted.
AMC7823
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
ADC ANALOG INPUTS
Input voltage range 0 2 × V
REF
V
Input impedance 5 MΩ
Input capacitance 15 pF
Input leakage current ±1 μA
ANALOG-TO-DIGITAL CONVERTER
Resolution 12 Bits
No missing codes 12 Bits
Integral linearity –1.25 +1.25 LSB
(1)
Differential linearity –1 +1.25 LSB
Offset error ±2 LSB
Offset error drift ±4 ppmFS/°C
Offset error match 0.5 1 LSB
Gain error ±6 LSB
Gain error match 0.3 1 LSB
Noise 70 μV
RMS
Power-supply rejection AV
DD
= 5V ±5% 70 dB
Sample rate
(2)
200 kHz
Total conversion time Scan Channels 0 through 7 45 μs
Total conversion time including temperature Scan Channels 0 through 8 56 μs
Channel-to-channel isolation V
IN
= 5V
PP
at 10kHz 0.5 LSB
DIGITAL-TO-ANALOG CONVERTER
(3)
Output voltage range Programmable 0 2 × V
REF
V
Output current Refer to Typical Characteristics ±1 mA
Resolution 12 Bits
Integral linearity
(4)
±2 ±8 LSB
Monotonicity 12 Bits
Differential linearity ±0.2 ±1 LSB
Output range = 0 to V
REF
±0.5 ±5 mV
Offset error
Output range = 0 to 2 × V
REF
±1 ±10 mV
Offset error drift ±4 ppmFS/°C
Gain error Output range = 0 to 2 × V
REF
±0.3 ±1.0 %FS
Step between code 0x400 to 0xC00,
Settling time 2 μs
to ±1LSB
Code change glitch 1LSB change, in worst case 20 nV-s
Overshoot Step between code 0x400 to 0xC00 200 mV
Crosstalk Step between code 0x400 to 0xC00 < 0.5 LSB
Sine wave (1kHz, 5V
PP
) generated by DAC,
Signal-to-noise ratio sampling at 400kSPS, R
L
= 10kΩ, 74 dB
C
L
= 100pF
Output buffer gain = 2 60 nV/√Hz
Output noise voltage density
Output buffer gain = 1 30 nV/√Hz
(1) LSB means least significant bit.
(2) Single-channel conversion only. Does not include control logic delay associated with ADC operation, such as from the trigger signal to
the start of conversion.
(3) DAC is tested with load of 25kΩ in parallel with 100pF to ground.
(4) Measured from code 0x008 to 0xFFF.
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