FUNCTIONAL BLOCK DIAGRA " />
參數(shù)資料
型號(hào): LTC1418ACG#TRPBF
廠商: Linear Technology
文件頁(yè)數(shù): 27/28頁(yè)
文件大小: 0K
描述: IC A/D CONV 14BIT SRL&PAR 28SSOP
標(biāo)準(zhǔn)包裝: 2,000
位數(shù): 14
采樣率(每秒): 200k
數(shù)據(jù)接口: 串行,并聯(lián)
轉(zhuǎn)換器數(shù)目: 1
功率耗散(最大): 21.5mW 單極;31.5mW 雙極
電壓電源: 雙 ±
工作溫度: 0°C ~ 70°C
安裝類型: 表面貼裝
封裝/外殼: 28-SSOP(0.209",5.30mm 寬)
供應(yīng)商設(shè)備封裝: 28-SSOP
包裝: 帶卷 (TR)
輸入數(shù)目和類型: 2 個(gè)單端,單極;2 個(gè)單端,雙極;1 個(gè)差分,單極;1 個(gè)差分,雙極
配用: DC178A-ND - BOARD SAR ADC LTC1418
8
LTC1418
FUNCTIONAL BLOCK DIAGRA
UU
W
14-BIT CAPACITIVE DAC
COMP
REF AMP
2.5V REF
8k
REFCOMP
4.096V
2.5V
CSAMPLE
D13
D0
BUSY
CONTROL LOGIC
D2/(CLKOUT)
INTERNAL
CLOCK
SHDN
D0 (EXT/INT)
D4 (EXTCLKIN)
CONVST RD CS
ZEROING SWITCHES
D1/(DOUT)
NOTE: PIN NAMES IN PARENTHESES
REFER TO SERIAL MODE
D3/(SCLK)
VDD: 5V
VSS: 0V FOR UNIPOLAR MODE
– 5V FOR BIPOLAR MODE
AIN
+
AIN
VREF
AGND
DGND
14
1418 BD
+
SUCCESSIVE APPROXIMATION
REGISTER
SHIFT
REGISTER
SER/PAR
MUX
APPLICATIONS INFORMATION
WU
U
CONVERSION DETAILS
The LTC1418 uses a successive approximation algorithm
and an internal sample-and-hold circuit to convert an
analog signal to a 14-bit parallel or serial output. The ADC
is complete with a precision reference and an internal
clock. The control logic provides easy interface to micro-
processors and DSPs (please refer to Digital Interface
section for the data format).
Conversion start is controlled by the CS and CONVST
inputs. At the start of the conversion the successive
approximation register (SAR) is reset. Once a conversion
cycle has begun it cannot be restarted.
During the conversion, the internal differential 14-bit
capacitive DAC output is sequenced by the SAR from the
most significant bit (MSB) to the least significant bit (LSB).
1418 F01
OUTPUT
LATCH
SAR
CDAC
+
CDAC
VDAC
VDAC
+
+
COMP
D13
D0
14
HOLD
AIN
+
AIN
ZEROING SWITCHES
CSAMPLE
CSAMPLE
+
HOLD
SAMPLE
Figure 1. Simplified Block Diagram
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