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參數(shù)資料
| 型號： | LTC1288 |
| 廠商： | Linear Technology Corporation |
| 元件分類： | Codec |
| 英文描述： | Single Channel Codec-Bandwidth Independent of Sampling Rate 28-PLCC 0 to 70 |
| 中文描述： | 3V的微采樣12位A / D轉(zhuǎn)換器的蘇- 8封裝 |
| 文件頁數(shù)： | 10/24頁 |
| 文件大小： | 412K |
| 代理商： | LTC1288 |
10
LTC1285/LTC1288
APPLICATIO
I
FOR
ATIO
U
OVERVIEW
The LTC1285 and LTC1288 are 3V micropower, 12-bit,
successive approximation sampling A/D converters. The
LTC1285 typically draws 160
μ
A of supply current when
sampling at 7.5kHz while the LTC1288 nominally con-
sumes 210
μ
A of supply current when sampling at 6.6 kHz.
The extra 50
μ
A of supply current on the LTC1288 comes
from the reference input which is intentionally tied to the
supply. Supply current drops linearly as the sample rate is
reduced (see Supply Current vs Sample Rate). The ADCs
automatically power down when not performing conver-
sions, drawing only leakage current. They are packaged in
8-pin SO and DIP packages. The LTC1285 and LTC1288
operate on a single supply from 2.7V to 6V.
Both the LTC1285 and the LTC1288 contain a 12-bit,
switched-capacitor ADC, a sample-and-hold, and a serial
port (see Block Diagram). Although they share the same
W
U
U
basic design, the LTC1285 and LTC1288 differ in some
respects. The LTC1285 has a differential input and has an
external reference input pin. It can measure signals float-
ing on a DC common-mode voltage and can operate with
reduced spans to 1.5V. Reducing the spans allows it to
achieve 366
μ
V resolution. The LTC1288 has a two-chan-
nel input multiplexer and can convert either channel with
respect to ground or the difference between the two. The
reference input is tied to the supply pin.
SERIAL INTERFACE
The 2-channel LTC1288 communicates with micropro-
cessors and other external circuitry via a synchronous,
half duplex, 4-wire serial interface. The single channel
LTC1285 uses a 3-wire interface (see Operating Sequence
in Figures 1 and 2).
Figure 1. LTC1285 Operating Sequence
CLK
CS
t
CYC
B11
B5
B6
B7
B8
B9
B10
B11
HI-Z
D
OUT
t
CONV
t
DATA
HI-Z
t
suCS
NULL
BIT
B4
B3
B2
B1
POWER
DOWN
POWER DOWN
B0*
NULL
BIT
B10
B9
B8
t
SMPL
(MSB)
(MSB)
CLK
CS
t
CYC
B11*
B5
B6
B7
B8
B9
B10
B11
HI-Z
D
OUT
t
CONV
t
DATA
HI-Z
t
suCS
NULL
BIT
LTC1285/88 F01
B4
B3
B3
B4
B5
B6
B7
B2
B2
B1
B0
B1
B10
B9
B8
t
SMPL
*AFTER COMPLETING THE DATA TRANSFER, IF FURTHER CLOCKS ARE APPLIED WITH CS LOW,
THE ADC WILL OUTPUT ZEROS INDEFINITELY.
t
: DURING THIS TIME, THE BIAS CIRCUIT AND THE COMPARATOR POWER DOWN AND THE REFERENCE INPUT
BECOMES A HIGH IMPEDANCE NODE, LEAVING THE CLK RUNNING TO CLOCK OUT LSB-FIRST DATA OR ZEROES.
*AFTER COMPLETING THE DATA TRANSFER, IF FURTHER CLOCKS ARE APPLIED WITH CS LOW,
THE ADC WILL OUTPUT LSB-FIRST DATA THEN FOLLOWED WITH ZEROS INDEFINITELY.
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| LTC1288CS8 | 3V Micropower Sampling 12-Bit A/D Converters in SO-8 Packages |
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