參數(shù)資料
型號(hào): DC845A
廠商: Linear Technology
文件頁(yè)數(shù): 26/28頁(yè)
文件大?。?/td> 0K
描述: BOARD DELTA SIGMA ADC LTC2448
軟件下載: QuikEval System
設(shè)計(jì)資源: DC845A Design File
DC845A Schematic
標(biāo)準(zhǔn)包裝: 1
系列: QuikEval™
ADC 的數(shù)量: 1
位數(shù): 24
采樣率(每秒): 8k
數(shù)據(jù)接口: MICROWIRE?,串行,SPI?
已用 IC / 零件: LTC2448
已供物品:
相關(guān)產(chǎn)品: LTC2448IUHF#PBF-ND - IC ADC 24BIT HI SPEED 38QFN
LTC2448CUHF#PBF-ND - IC ADC 24BIT HI SPEED 38QFN
LTC2448IUHF#TRPBF-ND - IC ADC 24BIT HI SPEED 38QFN
LTC2448CUHF#TRPBF-ND - IC ADC 24BIT HI SPEED 38QFN
LTC2448CUHF-ND - IC ADC 24BIT HI SPEED 38QFN
LTC2448IUHF-ND - IC ADC 24BIT HI SPEED 38QFN
LTC2448CUHF#TR-ND - IC ADC 24BIT HI SPEED 38QFN
LTC2448IUHF#TR-ND - IC ADC 24BIT HI SPEED 38QFN
LTC2444/LTC2445/
LTC2448/LTC2449
7
2444589fb
TEST CIRCUITS
FU CTIO AL BLOCK DIAGRA
UU
W
Figure 1. Functional Block Diagram
1.69k
SDO
2440 TA03
Hi-Z TO VOH
VOL TO VOH
VOH TO Hi-Z
CLOAD = 20pF
1.69k
SDO
2440 TA04
Hi-Z TO VOL
VOH TO VOL
VOL TO Hi-Z
CLOAD = 20pF
VCC
APPLICATIO S I FOR ATIO
WU
U
CONVERTER OPERATION
Converter Operation Cycle
The LTC2444/LTC2445/LTC2448/LTC2449 are multi-
channel, high speed, delta-sigma analog-to-digital con-
verters with an easy to use 3- or 4-wire serial interface (see
Figure 1). Their operation is made up of three states. The
converter operating cycle begins with the conversion,
followed by the low power sleep state and ends with the
data output/input (see Figure 2). The 4-wire interface
consists of serial data input (SDI), serial data output
(SDO), serial clock (SCK) and chip select (CS). The inter-
face, timing, operation cycle and data out format is com-
patible with Linear’s entire family of
Σconverters.
Figure 2. LTC2444/LTC2445/LTC2448/LTC2449
State Transition Diagram
AUTOCALIBRATION
AND CONTROL
DIFFERENTIAL
3RD ORDER
Σ MODULATOR
DECIMATING FIR
ADDRESS
INTERNAL
OSCILLATOR
SERIAL
INTERFACE
GND
VCC
CH0
CH1
CH15
COM
IN+
IN
MUX
SDO
SCK
REF+
REF
CS
SDI
FO
(INT/EXT)
2444 F01
+
CONVERT
SLEEP
CHANNEL SELECT
SPEED SELECT
DATA OUTPUT
POWER UP
IN+=CH0, IN=CH1
OSR=256,1X MODE
2444 F02
CS = LOW
AND
SCK
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