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參數(shù)資料
| 型號： | AD776 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 16-Bit 100 kSPS Oversampling ADC(16位100kSPS過采樣A/D轉(zhuǎn)換器) |
| 中文描述： | 16位100 kSPS的采樣ADC的（16位100ksps的過采樣的A / D轉(zhuǎn)換器） |
| 文件頁數(shù)： | 1/12頁 |
| 文件大小： | 257K |
| 代理商： | AD776 |
FUNCT IONAL BLOCK DIAGRAM
ANALOG
FRONT
END
16:1
DECIMATION
COMB
FILTER
SYSTEM TIMING AND CONTROL
4:1
DECIMATION
FIR
FILTER
SERIAL
INTERFACE
AD776
5
4
1
13
9
11
10
AGND
CLKIN
FSI
SF
DOE
DOUT
CLK
20
2
3
AIN+
AIN–
REFIN
19
REFOUT
8
6
FSEL
DV
DD
18
AV
DD
DGND
DOUT
6.4MHz
12.8MHz
3.2MHz
6.4MHz
7
12
FSO
X
U
M
V
REF
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.
a
16-Bit 100 kSPS
Oversampling ADC
AD776
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703
FEATURES
Monolithic 16-Bit Sigma-Delta ADC
Third-Order Noise Shaping
96 dB Dynamic Range
90 dB SNR
16-Bit 100 kHz Output from FIR Filter
12-Bit 400 kHz Output from Comb Filter
No Missing Codes
<0.001 dB In-Band Ripple
APPLICATIONS
Digital Audio Disk/Tape
Voice Bandwidth Communications
ADC Support for ADSP-21xx
High Accuracy Measurement Systems
PRODUCT DE SCRIPT ION
T he AD776 is a 16-bit sigma-delta oversampled ADC, incorpo-
rating a 1-bit third-order modulator and digital decimation filter.
An on-chip voltage reference circuit is also included.
T he AD776 does not generally require the use of sample-hold
circuits or complex antialiasing filters as a result of its sigma-
delta architecture. T he output is available both before and after
the final Finite Impulse Response (FIR) decimation filter. T his
provides the flexibility of optimizing conversion speed or dy-
namic range: 12-bit/400 kHz (from the comb filter) or 16-bit/
100 kHz (from the FIR filter). T he serial port provides easy in-
terface with a variety of standard processors including the
ADSP-21xx.
T he AD776 is specified for ac (or “dynamic”) parameters such
as SNR, T HD and IMD which are important in signal process-
ing and audio applications. T hird order noise shaping is employed
using 64 times oversampling to provide 90 dB SNR and –100 dB
peak spurious component for signal bandwidths up to 45 kHz.
T he AD776 operates from a single +5 V supply and typically
consumes 350 mW during conversion. T he device is packaged
in 20-pin ceramic DIP (cerdip) and is offered in an industrial
temperature grade (–40
°
C to +85
°
C).
PRODUCT HIGHLIGHT S
1. Analog Front End. T he analog input is differential providing
increased signal swing, increased power supply rejection ra-
tio, and reduced sensitivity to clock jitter. Since the input sig-
nal is oversampled by a factor of 64, a complex antialiasing
filter is not needed.
2. Flexible Digital Interface. T he AD776 has three output pins
for the serial interface: 1) serial data out (DOUT ), 2) frame
sync out (FSO), and 3) serial clock out (DOUT CLOCK ).
T he serial port can interface with general purpose DSPs such
as the ADSP-21xx, T MS320xx, and DSP56001/2 without
additional “glue” logic.
3. Inherently Self-Sampling. T he AD776 needs no external
sample-and-hold amplifier to capture and freeze the analog
input while the conversion takes place.
4. Speed/Performance Options. In addition to the standard
16-bit resolution at 100 kHz, the output of the comb filter
can be accessed to provide 12-bit resolution at 400 kHz.
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