參數(shù)資料
型號(hào)： LTC1859CG
廠商： Linear Integrated Systems
英文描述： 8-Channel, 12-/14-/16-Bit, 100ksps SoftSpan A/D Converters with Shutdown
中文描述： 8通道，12-/14-/16-Bit，100ksps的具有關(guān)斷SoftSpan的A / D轉(zhuǎn)換器
文件頁(yè)數(shù)： 12/20頁(yè)
文件大?。?/td> 265K
代理商： LTC1859CG
12
LTC1857/LTC1858/LTC1859
185789f
buffer or the output of the reference is available at V
REF
(Pin 15). The internal reference can be overdriven with an
external reference if more accuracy is needed. The buffer
output drives the internal DAC and is available at REFCOMP
(Pin 16). The REFCOMP pin can be used to drive a steady
DC load of less than 2mA. Driving an AC load is not
recommended because it can cause the performance of
the converter to degrade.
successive integer LSB values (i.e., 0.5LSB, 1.5LSB,
2.5LSB, … FS – 1.5LSB). The output code is natural binary
with 1LSB = FS/65536. Figure 4b shows the input/output
transfer characteristics for the bipolar mode in two’s
complement format.
FULL SCALE AND OFFSET
In applications where absolute accuracy is important,
offset and full-scale errors can be adjusted to zero during
a calibration sequence. Offset error must be adjusted
before full-scale error. Zero offset is achieved by adjusting
the offset applied to the “–” input. For single-ended inputs,
this offset should be applied to the COM pin. For differen-
tial inputs, the “–” input is dictated by the MUX address.
For unipolar zero offset error, apply 0.5LSB (actual voltage
will vary with input span selected) to the “+” input and
adjust the offset at the “–” input until the output code
flickers between 0000 0000 0000 0000 and 0000 0000
0000 0001 for the LTC1859, between 00 0000 0000 0000
and 00 0000 0000 0001 for the LTC1858 and between
0000 0000 0000 and 0000 0000 0001 for the LTC1857.
For bipolar zero error, apply –0.5LSB (actual voltage will
vary with input span selected) to the “+” input and adjust
the offset at the “–” input until the output code flickers
between 0000 0000 0000 0000 and 1111 1111 1111
1111 for the LTC1859, between 00 0000 0000 0000 and
APPLICATIU
W
U
U
Figure 3. Internal or External Reference Source
2.5V
REFERENCE
1859 F03
12-/14-/16-BIT
CAPACITIVE DAC
1.6384X BUFFER
8k
V
REF
1
μ
F
15
2.5V
16 REFCOMP
0.1
μ
F
4.096V
10
μ
F
INPUT VOLTAGE (V)
0V
O
FS – 1LSB
1859 F4a
111...111
111...110
111...101
111...100
000...000
000...001
000...010
000...011
1
LSB
UNIPOLAR
ZERO
1LSB =
FS
65536
INPUT VOLTAGE (V)
0V
O
–1
LSB
1859 F4b
011...111
011...110
000...001
000...000
100...000
100...001
111...110
1
LSB
BIPOLAR
ZERO
111...111
FS/2 – 1LSB
–FS/2
1LSB =
FS
65536
Figure 4a. Unipolar Transfer Characteristics (UNI = 1)
Figure 4b. Bipolar Transfer Characteristics (UNI = 0)
For minimum code transition noise the V
REF
pin and the
REFCOMP pin should each be decoupled with a capacitor
to filter wideband noise from the reference and the buffer.
UNIPOLAR/BIPOLAR OPERATION
Figure 4a shows the ideal input/output characteristics for
the LTC1859. The code transitions occur midway between
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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LTC1859IG#TRPBF 功能描述:IC A/D CONV 8CH 16BIT 28-SSOP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:SoftSpan™ 標(biāo)準(zhǔn)包裝:1 系列:- 位數(shù):14 采樣率（每秒）:83k 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）:95mW 電壓電源:雙 ± 工作溫度:0°C ~ 70°C 安裝類型:通孔 封裝/外殼:28-DIP（0.600"，15.24mm） 供應(yīng)商設(shè)備封裝:28-PDIP 包裝:管件 輸入數(shù)目和類型:1 個(gè)單端，雙極
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