AD7851 Analog Devices, AD7851 Datasheet - Page 3

• Manufacturer Part Number: AD7851
• Description: 14-Bit, 333 kSPS, Serial Sampling A/D Converter
• Manufacturer: Analog Devices

Specifications of AD7851

• Resolution (bits): 14bit
• # Chan: 1
• Sample Rate: 333kSPS
• Interface: Ser,SPI
• Analog Input Type: Diff-Uni
• Ain Range: (Vref) p-p,Uni (Vref)
• Adc Architecture: SAR
• Pkg Type: DIP,SOIC,SOP

SPECIFICATIONS
Parameter
DYNAMIC PERFORMANCE
DC ACCURACY
ANALOG INPUT
REFERENCE INPUT/OUTPUT
LOGIC INPUTS
LOGIC OUTPUTS
CONVERSION RATE
REV. B
A Grade: f
(to 125 C), f
unless otherwise noted.)
Signal-to-Noise + Distortion Ratio
Total Harmonic Distortion (THD)
Peak Harmonic or Spurious Noise
Intermodulation Distortion (IMD)
Resolution
Integral Nonlinearity
Differential Nonlinearity
Unipolar Offset Error
Positive Full-Scale Error
Negative Full-Scale Error
Bipolar Zero Error
Input Voltage Ranges
Leakage Current
Input Capacitance
REF
Input Impedance
REF
REF
Input High Voltage, V
Input Low Voltage, V
Input Current, I
Input Capacitance, C
Output High Voltage, V
Output Low Voltage, V
Floating State Leakage Current
Floating State Output Capacitance
Output Coding
Conversion Time
Conversion + Track-and-Hold
Acquisition Time
Second-Order Terms
Third-Order Terms
Full Power Bandwidth
IN
OUT
OUT
Input Voltage Range
CLKIN
Output Voltage
Temperature Coefficient
SAMPLE
= 7 MHz (–40 C to +85 C), f
= 238 kHz; (AV
IN
IN
INL
INH
4
OL
OH
DD
= DV
1, 2
3
(SNR)
4
DD
= 5.0 V
SAMPLE
Version A
77
–86
–87
–86
–86
20
14
± 2
± 2
± 10
± 10
± 10
± 1
0 V to V
± V
± 1
20
4/V
150
3.696/4.496 3.696/4.496
50
V
0.4
± 10
10
V
0.4
± 10
10
Straight (Natural) Binary
Twos Complement
2.78
3.0
= 333 kHz; K Grade: f
DD
DD
REF
DD
5%, REF
– 1.0
– 0.4
/2
REF
1
IN
/REF
Version K
78
–86
–87
–90
–90
20
14
± 1
± 1
± 10
± 10
± 10
± 1
0 V to V
± V
± 1
20
4/V
150
50
V
0.4
± 10
10
V
0.4
± 10
10
3.25
3.5
DD
DD
REF
DD
OUT
– 1.0
– 0.4
/2
= 4.096 V External Reference; SLEEP = Logic High; T
CLKIN
REF
–3–
1
= 6 MHz (0 C to 85 C), f
Unit
dB min
dB max
dB max
dB typ
dB typ
MHz typ
Bits
LSB max
LSB max
LSB max
LSB max
LSB typ
LSB typ
V
V
µA max
pF typ
V min/max
kΩ typ
V min/max
ppm/°C typ
V min
V max
µA max
pF max
V min
V max
µA max
pF max
µs max
µs max
Test Conditions/Comments
Typically SNR Is 79.5 dB.
V
V
typically –96 dB.
V
fa = 9.983 kHz, fb = 10.05 kHz, f
fa = 9.983 kHz, fb = 10.05 kHz, f
@ 3 dB.
Guaranteed No Missed Codes to 14 Bits
Review: Adjusting the Offset Calibration
Register in the Calibration Registers section.
AIN(+) – AIN(–) = 0 V to V
biased up but AIN(+) cannot go below AIN(–).
AIN(+) – AIN(–) = –V
should be biased up and AIN(+) can go below
AIN(–) but cannot go below 0 V.
Functional from 1.2 V.
Resistor Connected to Internal Reference Node.
V
I
I
Unipolar Input Range.
Bipolar Input Range.
19.5 CLKIN Cycles.
21 CLKIN Cycles Throughput Rate.
SOURCE
SINK
IN
IN
IN
IN
= 10 kHz, Sine Wave, f
= 10 kHz, Sine Wave, f
= 10 kHz, f
= 0 V or V
SAMPLE
= 0.8 mA.
= 200 µA.
= 285 kHz; A and K Grade: f
DD
SAMPLE
.
REF
= 333 kHz.
/2 to +V
REF
SAMPLE
SAMPLE
A
= T
, AIN(–) can be
MIN
SAMPLE
SAMPLE
REF
= 333 kHz.
= 333 kHz,
CLKIN
to T
/2, AIN(–)
AD7851
MAX
= 333 kHz.
= 333 kHz.
= 5 MHz
,