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LTC1402

更新时间： 2023-12-20 18:46:14
品牌 Logo 应用领域
亚德诺 - ADI /
页数 文件大小 规格书
24页 285K
描述
具停机功能的串行 12 位、2.2Msps 采样 ADC

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LTC1402 数据手册

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LTC1402  
Serial 12-Bit, 2.2Msps  
Sampling ADC with Shutdown  
U
FEATURES  
DESCRIPTIO  
The LTC®1402 is a 12-bit, 2.2Msps sampling A/D con-  
verter. This high performance device includes a high dy-  
namic range sample-and-hold and a precision reference.  
It operates from a single 5V supply or dual ±5V supplies  
and draws only 90mW from 5V.  
■
Sample Rate: 2.2Msps  
■
72dB S/(N + D) and –89dB THD at Nyquist  
■
Power Dissipation: 90mW (Typ)  
■
80MHz Full Power Bandwidth Sampling  
■
No Missing Codes over Temperature  
■
Available in 16-Pin Narrow SSOP Package  
The versatile differential input offers a unipolar range of  
4.096V and a bipolar range of ±2.048V for dual supply  
systems where high performance op amps perform best,  
eliminating the need for special translation circuitry.  
■
Single Supply 5V or ±5V Operation  
■
Nap Mode with Instant Wake-Up: 15mW  
■
Sleep Mode: 10µW  
■
True Differential Inputs Reject Common Mode Noise  
The high common mode rejection allows users to elimi-  
nategroundloopsandcommonmodenoisebymeasuring  
signals differentially from the source.  
■
Input Range (1mV/LSB): 0V to 4.096V or ±2.048V  
■
Internal Reference Can Be Overdriven Externally  
■
3-Wire Interface to DSPs and Processors (SPI and  
MICROWIRETM Compatible)  
U
Outstanding AC performance includes 72dB S/(N + D) and  
–93dB SFDR at the Nyquist input frequency of 1.1MHz  
with dual ±5V supplies and –84dB SFDR with a single 5V  
supply.  
APPLICATIO S  
■ Telecommunications  
■
The LTC1402 has two power saving modes: Nap and  
Sleep. Nap mode consumes only 15mW of power and can  
wake up and convert immediately. In Sleep mode, it  
typically consumes 10µW of power. Upon power-up from  
Sleep mode, a reference ready (REFRDY) signal is avail-  
able in the serial data word to indicate that the reference  
has settled and the chip is ready to convert.  
High Speed Data and Signal Acquisition  
■
Digitally Multiplexed Data Acquisition Systems  
■
■
■
■
■
Digital Radio Receivers  
Spectrum Analysis  
Low Power and Battery-Operated Systems  
Handheld or Portable Instruments  
Imaging Systems  
The 3-wire serial port allows compact and efficient data  
transfer to a wide range of microprocessors, microcon-  
trollers and DSPs. A digital output driver power supply pin  
allows direct connection to 3V or lower logic.  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
MICROWIRE is a trademark of National Semiconductor Corp.  
W
BLOCK DIAGRA  
5V  
3V OR 5V  
5 Harmonic THD, 2nd, 3rd and SFDR  
vs Input Frequency (Unipolar)  
1
AV  
DD  
12 DV  
11 OV  
DD  
DD  
10µF  
0
THD  
SFDR  
–10  
3
+
A
IN  
–20  
–30  
2ND  
3RD  
SAMPLE-  
10  
OUTPUT  
BUFFER  
12-BIT ADC  
D
OUT  
AND-HOLD  
f
= 2.22MHz  
4
5
SAMPLE  
–
–40  
A
IN  
–50  
4.096V  
V
–60  
REF  
10µF  
64k  
64k  
–70  
–
+
–80  
8
BIP/UNI  
CONV  
SCK  
–90  
16  
15  
7
2.048  
REFERENCE  
TIMING  
LOGIC  
–100  
–110  
–120  
GAIN  
LTC1402  
1402 TA01  
14  
10µF  
–5V OR 0V  
V
SS  
2
AGND1  
6
AGND2  
13 DGND  
9 OGND  
4
5
6
7
10  
10  
10  
10  
INPUT FREQUENCY (Hz)  
1401 G05  
1
1234567...24

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