參數(shù)資料
型號: LTC1293BCSW#PBF
廠商: Linear Technology
文件頁數(shù): 4/28頁
文件大?。?/td> 0K
描述: IC DATA ACQ SYSTEM 12BIT 16-SOIC
標(biāo)準(zhǔn)包裝: 47
類型: 數(shù)據(jù)采集系統(tǒng)(DAS),ADC
分辨率(位): 12 b
采樣率(每秒): 46.5k
數(shù)據(jù)接口: 串行,并聯(lián)
電壓電源: 雙 ±
電源電壓: ±5V,5V
工作溫度: 0°C ~ 70°C
安裝類型: 表面貼裝
封裝/外殼: 16-SOIC(0.295",7.50mm 寬)
供應(yīng)商設(shè)備封裝: 16-SOIC
包裝: 管件
12
LTC1293/LTC1294/LTC1296
129346fs
U
S
A
O
PPLICATI
WU
U
I FOR ATIO
Bipolar Transfer Curve (UNI = 0)
OUTPUT CODE
1 1 1 1 1 1 1 1 1 1 1 1
1 1 1 1 1 1 1 1 1 1 1 0
1 0 0 0 0 0 0 0 0 0 0 1
1 0 0 0 0 0 0 0 0 0 0 0
INPUT VOLTAGE
–1LSB
–2LSB
–(VREF) + 1LSB
– (VREF)
INPUT VOLTAGE
(VREF = 5V)
–0.0024V
–0.0048V
–4.9976V
–5.00000V
OUTPUT CODE
0 1 1 1 1 1 1 1 1 1 1 1
0 1 1 1 1 1 1 1 1 1 1 0
0 0 0 0 0 0 0 0 0 0 0 1
0 0 0 0 0 0 0 0 0 0 0 0
INPUT VOLTAGE
VREF – 1LSB
VREF – 2LSB
1LSB
0V
INPUT VOLTAGE
(VREF = 5V)
4.9976V
4.9851V
0.0024V
0V
LTC1293 AI04a
Bipolar Output Code (UNI = 0)
INPUT
CONFIGURATION
UNIPOLAR MODE
BIPOLAR MODE
Single-Ended
Lower Value COM
–(REF
+ – REF) + COM
Upper Value (REF
+ – REF) + COM (REF+ – REF) + COM
Differential
Lower Value IN
–(REF
+ – REF) + IN
Upper Value (REF
+ – REF) + IN
(REF
+ – REF) + IN
The following discussion will demonstrate how the two
reference pins are to be used in conjunction with the
analog input multiplexer. In unipolar mode the input span
of the A/D is set by the difference in voltage on the REF
+ pin
and the REF
pin. In the bipolar mode the input span is
twice the difference in voltage on the REF+ pin and the
REF
pin. In the unipolar mode the lower value of the input
span is set by the voltage on the COM pin for single-ended
inputs and by the voltage on the minus input pin for
differential inputs. For the bipolar mode of operation the
voltage on the COM pin or the minus input pin set the
center of the input span.
The upper and lower value of the input span can now be
summarized in the following table:
The reference voltages REF+ and REF
can fall between
VCC and V
, but the difference (REF+ –REF) must be less
than or equal to VCC. The input voltages must be less than
or equal to VCC and greater than or equal to V
. For the
LTC1293 REF
= 0V.
The following examples are for a single-ended input con-
figuration.
Example 1: Let VCC = 5V, V
= 0V, REF+ = 4V, REF= 1V
and COM = 0V. Unipolar mode of operation. The resulting
input span is 0V
≤ IN+ ≤ 3V.
1LSB
V
REF
–2LSB
V
REF
–1LSB
V
REF
VIN
1 1 1 1 1 1 1 1 1 1 1 1
0 0 0 0 0 0 0 0 0 0 0 1
0 0 0 0 0 0 0 0 0 0 0 0
0 1 1 1 1 1 1 1 1 1 1 0
0 1 1 1 1 1 1 1 1 1 1 1
1 1 1 1 1 1 1 1 1 1 1 0
1 0 0 0 0 0 0 0 0 0 0 1
1 0 0 0 0 0 0 0 0 0 0 0
–1LSB
–2LSB
–V
REF
–V
REF
+
1LSB
LTC1293 AI04b
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