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| 型号： | LTC1197LIMS8#TR |
| 厂商： | Linear Technology |
| 文件页数： | 4/28页 |
| 文件大小： | 0K |
| 描述： | IC ADC 10BIT 250KHZ W/SD 8-MSOP |
| 标准包装： | 2,500 |
| 位数： | 10 |
| 采样率（每秒）： | 250k |
| 数据接口： | MICROWIRE?，串行，SPI? |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 25mW |
| 电压电源： | 单电源 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 8-MSOP |
| 包装： | 带卷 (TR) |
| 输入数目和类型： | 1 个差分，单极 |
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12
LTC1197/LTC1197L
LTC1199/LTC1199L
OVERVIEW
The LTC1197/LTC1197L/LTC1199/LTC1199L are 10-bit
switched-capacitor A/D converters. These sampling ADCs
typically draw 5mA of supply current when sampling up to
500kHz (800
A at 2.7V sampling up to 250kHz). Supply
current drops linearly as the sample rate is reduced (see
Supply Current vs Sample Rate in the Typical Perfor-
mance Characteristics). The ADCs automatically power
down when not performing a conversion, drawing only
leakage current. They are packaged in 8-pin MSOP and SO
packages. The LTC1197L/LTC1199L operate on a single
supply ranging from 2.7V to 4V. The LTC1197 operates on
a single supply ranging from 4V to 9V while the LTC1199
operates from 4V to 6V.
These ADCs contain a 10-bit, switched-capacitor ADC, a
sample-and-hold and a serial port (see Block Diagram).
Although they share the same basic design, the LTC1197/
LTC1197L and LTC1199/LTC1199L differ in some re-
spects. The LTC1197/LTC1197L have a differential input
and have an external reference input pin. They can mea-
sure signals floating on a DC common mode voltage and
can operate with reduced spans down to 200mV. Reduc-
ing the span allows it to achieve 200
V resolution. The
LTC1199/LTC1199L have a 2-channel input multiplexer
with the reference connected to the supply (VCC) pin. They
can convert the input voltage of either channel with re-
spect to ground or the difference between the voltages of
the two channels.
SERIAL INTERFACE
The LTC1199/LTC1199L communicate with microproces-
sors and other external circuitry via a synchronous, half
duplex, 4-wire serial interface while the LTC1197/
LTC1197L use a 3-wire interface (see Operating Sequence
in Figures 1 and 2). These interfaces are compatible with
both SPI and MICROWIRE protocols without requiring any
additional glue logic (see MICROPROCESSOR INTER-
FACES: Motorola SPI).
DATA TRANSFER
The CLK synchronizes the data transfer with each bit being
transmitted and captured on the rising CLK edge in both
transmitting and receiving systems. The LTC1199/
LTC1199L first receives input data and then transmits
back the A/D conversion result (half duplex). Because of
the half-duplex operation, DIN and DOUT may be tied
together allowing transmission over just three wires: CS,
CLK and DATA (DIN/DOUT).
Data transfer is initiated by a falling chip select (CS) signal.
After CS falls the LTC1199/LTC1199L look for a start bit on
the DIN input. After the start bit is received, the 3-bit input
word is shifted into the DIN input which configures the
LTC1199/LTC1199L and starts the conversion. After two
null bits, the result of the conversion is output on the DOUT
line in MSB-first format. At the end of the data exchange
CS should be brought high. This resets the LTC1199/
LTC1199L in preparation for the next data exchange.
Bringing CS high after the conversion also minimizes
supply current if CLK is left running.
Figure 1. LTC1197/LTC1197L Operating Sequence
1197/99 F01
CLK
CS
tdDO
tsuCS
B0*
B1
B2
B3
B4
B5
B6
B7
B8
B9
NULL
BITS
Hi-Z
14
13
12
11
10
9
8
7
6
5
4
3
2
1
DOUT
HI-Z
*AFTER COMPLETING THE DATA TRANSFER, IF FURTHER CLOCKS ARE APPLIED WITH CS LOW,
THE ADC WILL OUTPUT ZEROS INDEFINITELY
tCYC (14 CLKs )*
tSMPL
(1.5 CLKs)
POWER
DOWN
tCONV
(10.5 CLKs)
APPLICATIO S I FOR ATIO
WU
UU
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC1197LIS8 | 功能描述:IC ADC 10BIT 250KHZ W/SD 8-SOIC RoHS:否 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:2,500 系列:- 位数:16 采样率（每秒）:15 数据接口:MICROWIRE?，串行，SPI? 转换器数目:1 功率耗散（最大）:480µW 电压电源:单电源 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:38-WFQFN 裸露焊盘 供应商设备封装:38-QFN（5x7） 包装:带卷 (TR) 输入数目和类型:16 个单端，双极；8 个差分，双极 配用:DC1011A-C-ND - BOARD DELTA SIGMA ADC LTC2494 |
| LTC1197LIS8#PBF | 功能描述:IC ADC 10BIT 250KHZ W/SD 8-SOIC RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:2,500 系列:- 位数:16 采样率（每秒）:15 数据接口:MICROWIRE?，串行，SPI? 转换器数目:1 功率耗散（最大）:480µW 电压电源:单电源 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:38-WFQFN 裸露焊盘 供应商设备封装:38-QFN（5x7） 包装:带卷 (TR) 输入数目和类型:16 个单端，双极；8 个差分，双极 配用:DC1011A-C-ND - BOARD DELTA SIGMA ADC LTC2494 |
| LTC1197LIS8#TR | 功能描述:IC ADC 10BIT 250KHZ W/SD 8-SOIC RoHS:否 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:2,500 系列:- 位数:16 采样率（每秒）:15 数据接口:MICROWIRE?，串行，SPI? 转换器数目:1 功率耗散（最大）:480µW 电压电源:单电源 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:38-WFQFN 裸露焊盘 供应商设备封装:38-QFN（5x7） 包装:带卷 (TR) 输入数目和类型:16 个单端，双极；8 个差分，双极 配用:DC1011A-C-ND - BOARD DELTA SIGMA ADC LTC2494 |
| LTC1197LIS8#TRPBF | 功能描述:IC ADC 10BIT 250KHZ W/SD 8-SOIC RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:2,500 系列:- 位数:16 采样率（每秒）:15 数据接口:MICROWIRE?，串行，SPI? 转换器数目:1 功率耗散（最大）:480µW 电压电源:单电源 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:38-WFQFN 裸露焊盘 供应商设备封装:38-QFN（5x7） 包装:带卷 (TR) 输入数目和类型:16 个单端，双极；8 个差分，双极 配用:DC1011A-C-ND - BOARD DELTA SIGMA ADC LTC2494 |
| LTC1198 | 制造商:LINER 制造商全称:Linear Technology 功能描述:8-Bit, SO-8, 1MSPS ADCs with Auto-Shutdown Options |
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