参数资料
型号: LTC1608CG#TR
厂商: Linear Technology
文件页数: 18/20页
文件大小: 0K
描述: IC ADC 16BIT 5V SAMPLING 36SSOP
标准包装: 2,000
位数: 16
采样率(每秒): 500k
数据接口: 并联
转换器数目: 1
功率耗散(最大): 420mW
电压电源: 模拟和数字,双 ±
工作温度: 0°C ~ 70°C
安装类型: 表面贴装
封装/外壳: 36-SSOP(0.209",5.30mm 宽)
供应商设备封装: 36-SSOP
包装: 带卷 (TR)
输入数目和类型: 2 个单端,双极;1 个差分,双极
7
LTC1608
UU
W
FU CTIO AL BLOCK DIAGRA
Load Circuits for Access Timing
Load Circuits for Output Float Delay
1k
(A) Hi-Z TO VOH AND VOL TO VOH
CL
1k
5V
DN
(B) Hi-Z TO VOL AND VOH TO VOL
CL
1608 TC01
1k
(A) VOH TO Hi-Z
CL
1k
5V
DN
(B) VOL TO Hi-Z
CL
1608 TC02
TEST CIRCUITS
2.2
F
10
F
10
F
10
22
F
4
6
DIFFERENTIAL
ANALOG INPUT
±2.5V
REFCOMP
4.375V
CONTROL
LOGIC
AND
TIMING
B15 TO B0
16-BIT
SAMPLING
ADC
+
10
F
5V OR
3V
P
CONTROL
LINES
D15 TO D0
OUTPUT
BUFFERS
16-BIT
PARALLEL
BUS
11 TO 26
1608 BD
OGND
OVDD
28
29
1
2
AIN
+
AIN
SHDN
CS
CONVST
RD
BUSY
33
32
31
30
27
7.5k
3
36
35
10
9
5V
AVDD
DVDD
DGND
VREF
8
AGND
7
AGND
5
AGND
34
–5V
VSS
10
F
2.5V
REF
10
F
1.75X
+
APPLICATIO S I FOR ATIO
WU
UU
CONVERSION DETAILS
The LTC1608 uses a successive approximation algorithm
and internal sample-and-hold circuit to convert an analog
signal to a 16-bit parallel output. The ADC is complete with
a sample-and-hold, a precision reference and an internal
clock. The control logic provides easy interface to micro-
processors and DSPs. (Please refer to the 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) resets. Once a conversion
cycle has begun, it cannot be restarted.
During the conversion, the internal differential 16-bit
capacitive DAC output is sequenced by the SAR from the
Most Significant Bit (MSB) to the Least Significant Bit
(LSB). Referring to Figure 1, the AIN+ and AIN– inputs are
acquired during the acquire phase and the comparator
offset is nulled by the zeroing switches. In this acquire
phase, a duration of 480ns will provide enough time for the
sample-and-hold capacitors to acquire the analog signal.
During the convert phase, the comparator zeroing switches
open, putting the comparator into compare mode. The
input switches connect the CSMPL capacitors to ground,
transferring the differential analog input charge onto the
summing junctions. This input charge is successively
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