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Analog Devices Semiconductor Electronic Components Datasheet

AD7889 Datasheet

12-bit successive approximation analog-to-digital converters

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AD7889 pdf
a
LC2MOS Single Supply,
12-Bit 600 kSPS ADC
Preliminary Technical Information
AD7889
www.datasFhEeAetT4Uu.RcoEmS
Fast 12-Bit ADC with 1.4 µs Conversion Time
Up to 600 kSPS Throughput Rate (Mode A)
Single Supply Operation
On-Chip Track/Hold Amplifier
Selection of Input Ranges:
±10 V or ±5 V for AD7889-1
0 V to +2.5 V or 0V to+5 V for AD7889-2
±2.5 V for AD7889-3
High Speed Serial Interface
Low Power, 60 mW typ
FUNCTIONAL BLOCK DIAGRAM
VREF
VDD
2½K
+2.5V
REFERENCE
AD7889
VIN1 SIGNAL
VIN2 SCALING
TRACK
/HOLD
12-BIT
ADC
RFS
SDATA
SCLK
CONTROL LOGIC
STANDBY
CONVST CONTCLK 16/14B
AGND DGND
GENERAL DESCRIPTION
The AD7889 is a high speed, low power, 12-bit A/D converter
that operates from a single +5 V supply. The part contains a
successive approximation ADC, an on-chip track/hold ampli-
fier, an internal +2.5 V reference and on-chip versatile
interface structures that allows serial communication
to a microprocessor in a variety of operating modes. The part
accepts an analog input range of ±10 V or ±5 V (AD7889-1),
0 V to +2.5 V or 0 V to +5V (AD7889-2) and ±2.5 V
(AD7889-3). Overvoltage protection on the analog inputs for the
AD7889-1 and AD7889-3 allows the input voltage to go to
±17 V or ±7 V respectively without damaging the ports.
The AD7889 offers a choice of serial interface modes which al-
lows direct connection to the serial ports of microcontrollers
and digital signal processors.
In addition to the traditional dc accuracy specifications such as
linearity, full-scale and offset errors, the part is also specified
for dynamic performance parameters including harmonic dis-
tortion and signal-to-noise ratio.
The AD7889 is fabricated in Analog Devices’ Linear Compat-
ible CMOS (LC2MOS) process, a mixed technology process
that combines precision bipolar circuits with low power CMOS
logic. It is available in a 16-pin, SSOP.
PRODUCT HIGHLIGHTS
1. The AD7889 features a conversion time of 1.4µs (Mode A)
and a track/hold acquisition time of 300ns. This allows a
throughput rate for the part up to 600 kSPS. Modes C and
D can be used to allow a throughput rate of 500kSPS.
2. The AD7889 operates from a single +5 V supply and con-
sumes 60 mW typ making it ideal for low power and por-
table applications.
3. The part offers a high speed, serial interface for easy connec-
tion to microprocessors, microcontrollers and digital signal
processors.
REV. B
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
© Analog Devices, Inc., 1996
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703


Analog Devices Semiconductor Electronic Components Datasheet

AD7889 Datasheet

12-bit successive approximation analog-to-digital converters

No Preview Available !

AD7889 pdf
AD7889–SPECIFICATIONS (VDD = +5 V ± 5%, AGND = DGND = 0 V, REF IN = +2.5 V. All specifications TMIN to
TMAX unless otherwise noted.)
Parameter
A Versions1 B Versions S Version2 Units
Test Conditions/Comments
DYNAMIC PERFORMANCE
AD7889-1, AD7889-2
Signal to (Noise + Distortion) Ratio3
Total Harmonic Distortion3
Peak Harmonic or Spurious Noise3
Intermodulation Distortion3
www.da2tnadshOeredte4ruT.ceormms
3rd Order Terms
AD7889-3
Signal to (Noise + Distortion) Ratio3
Total Harmonic Distortion3
Peak Harmonic or Spurious Noise3
Intermodulation Distortion3
2nd Order Terms
3rd Order Terms
70
–80
–81
–80
–80
70
–78
–79
–78
–78
70 70
–80 –78
–81 –79
–80 –78
–80 –78
70
–78
–79
–78
–78
dB min
dB max
dB max
dB max
dB max
dB min
dB max
dB max
dB max
dB max
fIN = 100 kHz. fSAMPLE = 500 kSPS
fa = 49 kHz, fb = 50 kHz
fIN = 100 kHz. fSAMPLE = 600 kSPS
fa = 49 kHz, fb = 50 kHz
DC ACCURACY
Resolution
Minimum Resolution for Which No
Missing Codes Are Guaranteed
Relative Accuracy3
Differential Nonlinearity3
Positive Full-Scale Error3
AD7889-1
Negative Full-Scale Error3
Bipolar Zero Error3
AD7889-3
Negative Full-Scale Error3
Bipolar Zero Error3
AD7889-2 Only
Unipolar Offset Error3
12
12
±4
±4
±3
±4
±4
±4
12 12
12 12
±1 ±1
±1 ±1
±4 ±5
±4 ±5
±2 ±3
±4
±3
±3 ±4
Bits
Bits
LSB max
LSB max
LSB max
LSB max
LSB max
LSB max
LSB max
LSB max
ANALOG INPUT
AD7889-1
Input Voltage Range
Input Voltage Range
Input Resistance
AD7889-2
Input Voltage Range on VIN1
Input Voltage Range on VIN1
Input Current
AD7889-3
Input Voltage Range on VIN1
Input Resistance
±10
±5
25
0 to +5
0 to +2.5
10
±2.5
2
±10
±5
25
0 to +5
0 to +2.5
10
±2.5
2
±10
±5
25
0 to +5
0 to +2.5
50
Volts
Volts
kmin
Volts
Volts
nA max
Volts
kmin
Input Applied to VIN1 with VIN2 Grounded
Input Applied to VIN1 and VIN2
Input Applied to VIN1 with VIN2 Grounded
Input Applied to VIN1 with VIN2 Grounded
Input Applied to VIN1 and VIN2
Input Applied to VIN1
REFERENCE OUTPUT/INPUT
VREF Input Voltage Range
Input Impedance
Input Capacitance4
VREF Output Voltage
VREF Error @ +25°C
TMIN to TMAX
VREF Temperature Coefficient
VREF Output Impedance
2.375/2.625
1.6
10
2.5
±10
±20
25
5.5
2.375/2.625
1.6
10
2.5
±10
±20
25
5.5
2.375/2.625
1.6
10
2.5
±10
±25
25
5.5
V min/V max
kmin
pF max
V nom
mV max
mV max
ppm/°C typ
knom
2.5 V ± 5%
Resistor Connected to Internal Reference Node
LOGIC INPUTS
Input High Voltage, VINH
Input Low Voltage, VINL
Input Current, IIN
Input Capacitance, CIN4
2.4 2.4 2.4
0.8 0.8 0.8
±10 ±10 ±10
10 10 10
V min
V max
µA max
pF max
VDD = 5 V ± 5%
VDD = 5 V ± 5%
VIN = 0 V to VDD
REV. B PRELIM. 7/97
2


Part Number AD7889
Description 12-bit successive approximation analog-to-digital converters
Maker Analog Devices
Total Page 12 Pages
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