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Analog Devices Semiconductor Electronic Components Datasheet

AD676 Datasheet

16-Bit 100 kSPS Sampling ADC

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AD676 pdf
a
16-Bit 100 kSPS
Sampling ADC
FEATURES
Autocalibrating
On-Chip Sample-Hold Function
Parallel Output Format
16 Bits No Missing Codes
؎1 LSB INL
–97 dB THD
90 dB S/(N+D)
1 MHz Full Power Bandwidth
AD676
FUNCTIONAL BLOCK DIAGRAM
VIN 15
AGND SENSE 14
VREF 16
AGND 13
INPUT
BUFFERS
16-BIT
DAC
CAL
DAC
ANALOG
CHIP
COMP
LOGIC & TIMING
LEVEL TRANSLATORS
PRODUCT DESCRIPTION
The AD676 is a multipurpose 16-bit parallel output analog-to-
digital converter which utilizes a switched-capacitor/charge
redistribution architecture to achieve a 100 kSPS conversion
rate (10 µs total conversion time). Overall performance is opti-
mized by digitally correcting internal nonlinearities through
on-chip autocalibration.
The AD676 circuitry is segmented onto two monolithic chips—
a digital control chip fabricated on Analog Devices DSP CMOS
process and an analog ADC chip fabricated on our BiMOS II
process. Both chips are contained in a single package.
The AD676 is specified for ac (or “dynamic”) parameters such
as S/(N+D) Ratio, THD and IMD which are important in sig-
nal processing applications. In addition, dc parameters are
specified which are important in measurement applications.
DIGITAL
CHIP
CAL 8
SAMPLE 9
CLK 10
MICRO-CODED
CONTROLLER
SAR
PAT
GEN
ALU
RAM
7 BUSY
1
L
A6
T BIT 1 – BIT 16
C 19
H 28
AD676
The AD676 operates from +5 V and ± 12 V supplies and typi-
cally consumes 360 mW during conversion. The digital supply
(VDD) is separated from the analog supplies (VCC, VEE) for re-
duced digital crosstalk. An analog ground sense is provided for
the analog input. Separate analog and digital grounds are also
provided.
The AD676 is available in a 28-pin plastic DIP or 28-pin side-
brazed ceramic package. A serial-output version, the AD677, is
available in a 16-pin 300 mil wide ceramic or plastic package.
REV. A
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.
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

AD676 Datasheet

16-Bit 100 kSPS Sampling ADC

No Preview Available !

AD676 pdf
AD676–SPECIFICATIONS
AC SPECIFICATIONS (TMIN to TMAX, VCC = +12 V ؎ 5%, VEE = –12 V ؎ 5%, VDD = +5 V ؎ 10%)1
Parameter
AD676J/A
AD676K/B
Min Typ Max Min Typ
Max
Total Harmonic Distortion (THD)2
@ 83 kSPS, TMIN to TMAX
@ 100 kSPS, +25°C
@ 100 kSPS, TMIN to TMAX
Signal-to-Noise and Distortion Ratio (S/(N+D))2, 3
@ 83 kSPS, TMIN to TMAX
@ 100 kSPS, +25°C
@ 100 kSPS, TMIN to TMAX
Peak Spurious or Peak Harmonic Component
Intermodulation Distortion (IMD)4
2nd Order Products
3rd Order Products
Full Power Bandwidth
Noise
85
–96
0.0016
–96
0.0016
–92
0.0025
–88
0.004
89 87
89
86
–98
–102
–98
1
160
–97
0.0014
–97
0.0014
–92
0.0025
90
90
86
–98
–102
–98
1
160
–90
0.003
Units
dB
%
dB
%
dB
%
dB
dB
dB
dB
dB
dB
MHz
µV rms
DIGITAL SPECIFICATIONS (for all grades TMIN to TMAX, VCC = +12 V ؎ 5%, VEE = –12 V ؎ 5%, VDD = +5 V ؎ 10%)
Parameter
Test Conditions
Min Typ Max
Units
LOGIC INPUTS
VIH High Level Input Voltage
VIL Low Level Input Voltage
IIH High Level Input Current
IIL Low Level Input Current
CIN Input Capacitance
VIH = VDD
VIL = 0 V
2.4
–0.3
–10
–10
10
VDD + 0.3
0.8
+10
+10
V
V
µA
µA
pF
LOGIC OUTPUTS
VOH High Level Output Voltage
IOH = 0.1 mA
VDD –1 V
V
IOH = 0.5 mA
2.4
V
VOL Low Level Output Voltage
IOL = 1.6 mA
0.4 V
NOTES
1VREF = 10.0 V, (Conversion Rate (fs) = 83 kSPS, fIN = 1.0 kHz, VIN = –0.05 dB, Bandwidth = fs/2 unless otherwise indicated. All measurements referred to a 0 dB
(20 V p-p) input signal. Values are post-calibration.
2For other input amplitudes, refer to Figure 13.
3For other input ranges/voltages reference values see Figure 12.
4fa = 1008 Hz. fb = 1055 Hz. See Definition of Specifications section and Figure 15.
Specifications subject to change without notice.
–2– REV. A


Part Number AD676
Description 16-Bit 100 kSPS Sampling ADC
Maker Analog Devices
Total Page 16 Pages
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