參數(shù)資料
型號: LTC2452ITS8#TRPBF
廠商: Linear Technology
文件頁數(shù): 19/22頁
文件大?。?/td> 0K
描述: IC ADC 16BIT DELTA SIG TSOT23-8
標(biāo)準(zhǔn)包裝: 2,500
位數(shù): 16
采樣率(每秒): 60
數(shù)據(jù)接口: 串行,SPI?
轉(zhuǎn)換器數(shù)目: 2
功率耗散(最大): 2.4mW
電壓電源: 單電源
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: SOT-23-8 薄型,TSOT-23-8
供應(yīng)商設(shè)備封裝: TSOT-23-8
包裝: 帶卷 (TR)
輸入數(shù)目和類型: 1 個(gè)差分,雙極
配用: DC1384A-A-ND - BOARD DELTA SIGMA ADC LTC2452
LTC2452
6
2452fd
For more information www.linear.com/LTC2452
applicaTions inForMaTion
block DiagraM
pin FuncTions
SCK (Pin 1): Serial Clock Input. SCK synchronizes the
serial data output. While digital data is available (the ADC
is not in CONVERT state) and CS is LOW (ADC is not in
SLEEP state) a new data bit is produced at the SDO output
pin following every falling edge applied to the SCK pin.
GND (Pin 2): Ground. Connect to a ground plane through
a low impedance connection.
REF (Pin 3): Reference Input. The voltage on REF can have
any value between 2.5V and VCC. The reference voltage
sets the full-scale range.
VCC (Pin 4): Positive Supply Voltage. Bypass to GND
(Pin 2) with a 10F capacitor in parallel with a low-series-
inductance0.1FcapacitorlocatedasclosetotheLTC2452
as possible.
IN(Pin 5), IN+ (Pin 6): Differential Analog Input.
CS (Pin 7): Chip Select (Active LOW) Digital Input. A LOW
on this pin enables the SDO digital output. A HIGH on this
pin places the SDO output pin in a high impedance state.
SDO (Pin 8): Three-State Serial Data Output. SDO is used
for serial data output during the DATA OUTPUT state and
can be used to monitor the conversion status.
Exposed Pad (Pin 9): Ground. Must be soldered to PCB
ground. For prototyping purposes, this pad may remain
floating.
Figure 1. Functional Block Diagram
16-BIT ΔΣ
A/D CONVERTER
DECIMATING
SINC FILTER
SCK
REF
VCC
GND
IN+
IN
SDO
CS
2452 BD
16-BIT ΔΣ
A/D CONVERTER
SPI
INTERFACE
INTERNAL
OSCILLATOR
3
4
7
8
1
2, 9
6
5
CONVERTER OPERATION
Converter Operation Cycle
The LTC2452 is a low power, fully differential, delta-sigma
analog-to-digital converter with a simple 3-wire SPI in-
terface (see Figure 1). Its operation is composed of three
successive states: CONVERT, SLEEP and DATA OUTPUT.
The operating cycle begins with the CONVERT state, is
followed by the SLEEP state, and ends with the DATA OUT-
PUT state (see Figure 2). The 3-wire interface consists of
serial data output (SDO), serial clock input (SCK), and the
active low chip select input (CS).
TheCONVERTstatedurationisdeterminedbytheLTC2452
conversion time (nominally 16.6 milliseconds). Once
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