VDD
參數(shù)資料
型號: LTC1748IFW#PBF
廠商: Linear Technology
文件頁數(shù): 20/20頁
文件大小: 0K
描述: IC ADC 14BIT 80MSPS 48-TSSOP
標準包裝: 39
位數(shù): 14
采樣率(每秒): 80M
數(shù)據(jù)接口: 并聯(lián)
轉換器數(shù)目: 1
功率耗散(最大): 1.55W
電壓電源: 單電源
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 48-TFSOP(0.240",6.10mm 寬)
供應商設備封裝: 48-TSSOP
包裝: 管件
輸入數(shù)目和類型: 2 個單端,雙極;1 個差分,雙極
9
LTC1748
1748fa
UU
U
PI FU CTIO S
SENSE (Pin 1): Reference Sense Pin. Ground selects
±1V.
VDD selects ±1.6V. Greater than 1V and less than 1.6V
applied to the SENSE pin selects an input range of
±VSENSE,
±1.6V is the largest valid input range.
VCM (Pin 2): 2.35V Output and Input Common Mode Bias.
Bypass to ground with 4.7
F ceramic chip capacitor.
GND (Pins 3, 6, 9, 12, 13, 16, 19, 21, 36, 37): ADC Power
Ground.
AIN+ (Pin 4): Positive Differential Analog Input.
AIN– (Pin 5): Negative Differential Analog Input.
VDD (Pins 7, 8, 17, 18, 20): 5V Supply. Bypass to AGND
with 1
F ceramic chip capacitors at Pin 8 and Pin 18.
REFLB (Pin 10): ADC Low Reference. Bypass to Pin 11
with 0.1
F ceramic chip capacitor. Do not connect to
Pin 14.
REFHA (Pin 11): ADC High Reference. Bypass to Pin 10 with
0.1
Fceramicchipcapacitor,toPin14witha4.7Fceramic
capacitor and to ground with 1
F ceramic capacitor.
REFLA (Pin 14): ADC Low Reference. Bypass to Pin 15 with
0.1
F ceramic chip capacitor, to Pin 11 with a 4.7F ce-
ramic capacitor and to ground with 1
F ceramic capacitor.
REFHB (Pin 15): ADC High Reference. Bypass to Pin 14
with 0.1
F ceramic chip capacitor. Do not connect to
Pin 11.
MSBINV (Pin 22): MSB Inversion Control. Low inverts
the MSB, 2’s complement output format. High does not
invert the MSB, offset binary output format.
ENC (Pin 23): Encode Input. The input sample starts on the
positive edge.
ENC (Pin 24): Encode Complement Input. Conversion
starts on the negative edge. Bypass to ground with 0.1
F
ceramic for single-ended ENCODE signal.
OE (Pin 25): Output Enable. Low enables outputs. Logic
high makes outputs Hi-Z. OE should not exceed the
votlage on OVDD.
CLKOUT (Pin 26): Data Valid Output. Latch data on the
rising edge of CLKOUT.
OGND (Pins 27, 38, 47): Output Driver Ground.
D0-D3 (Pins 28 to 31): Digital Outputs.
OVDD (Pins 32, 43): Positive Supply for the Output Driv-
ers. Bypass to ground with 0.1
F ceramic chip capacitor.
D4-D6 (Pins 33 to 35): Digital Outputs.
D7-D10 (Pins 39 to 42): Digital Outputs.
D11-D13 (Pins 44 to 46): Digital Outputs.
OF (Pin 48): Over/Under Flow Output. High when an over
or under flow has occurred.
Supply Current vs Sample Rate
SAMPLE RATE (Msps)
0
280
290
300
80
1748 G32
270
260
20
40
60
100
250
240
230
SUPPLY
CURRENT
(mA)
TA = 25°C
TYPICAL PERFOR A CE CHARACTERISTICS
UW
Offset and Gain Error
vs Temperature
TEMPERATURE (
°C)
–50
ERROR
(LSB)
6
GAIN ERROR
OFFSET ERROR
10
1748 G35
0
–4
–30
–10
30
–6
–8
8
4
2
–2
50
70
90
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