參數(shù)資料
型號: LTC1282ACSW
廠商: LINEAR TECHNOLOGY CORP
元件分類: ADC
英文描述: 3V 140ksps 12-Bit Sampling A/D Converter with Reference
中文描述: 1-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, PARALLEL ACCESS, PDSO24
封裝: 0.300 INCH, PLASTIC, SOP-24
文件頁數(shù): 9/24頁
文件大?。?/td> 439K
代理商: LTC1282ACSW
9
LTC1282
PU
U
A
IN
(Pin 1):
Analog Input. 0V to 2.5V (Unipolar),
±
1.25V
(Bipolar).
V
REF
(Pin 2):
+1.20V Reference Output. Bypass to
AGND (10
μ
F tantalum in parallel with 0.1
μ
F ceramic).
AGND (Pin 3):
Analog Ground.
D11-D4 (Pins 4 to 11):
Three-State Data Outputs. D11
is the Most Significant Bit.
DGND (Pin 12):
Digital Ground.
D3/11-D0/8 (Pins 13 to 16):
Three-State Data Outputs.
NC (Pins 17 and 18):
No Connection.
HBEN (Pin 19):
High Byte Enable Input. This pin is used
to multiplex the internal 12-bit conversion result into
the lower bit outputs (D7 and D0/8). See Table 1. HBEN
also disables conversion start when HIGH.
U
RD (Pin 20):
READ Input. This active low signal starts a
conversion when CS and HBEN are low. RD also enables
the output drivers when CS is low.
CS (Pin 21):
The CHIP SELECT Input must be low for the
ADC to recognize RD and HBEN inputs.
BUSY (Pin 22):
The BUSY Output shows the converter
status. It is low when a conversion is in progress.
V
SS
(Pin 23):
Bipolar Mode — Negative Supply, –3V.
Bypass to AGND with 0.1
μ
F ceramic.
Unipolar Mode — Tie to DGND.
V
DD
(Pin 24):
Positive Supply, 3V. Bypass to AGND (10
μ
F
tantalum in parallel with 0.1
μ
F ceramic).
Table 1. Data Bus Output, CS and RD = LOW
Pin 4
D11
DB11
DB11
Pin 5
D10
DB10
DB10
Pin 6
D9
DB9
DB9
Pin 7
D8
DB8
DB8
Pin 8
D7
DB7
LOW
Pin 9
D6
DB6
LOW
Pin 10
D5
DB5
LOW
Pin 11
D4
DB4
LOW
Pin 13
D3/11
DB3
DB11
Pin 14
D2/10
DB2
DB10
Pin 15
D1/9
DB1
DB9
Pin 16
D0/8
DB0
DB8
MNEMONIC*
HBEN = LOW
HBEN = HIGH
*D11...D0/8 are the ADC data output pins.
DB11...DB0 are the 12-bit conversion results, DB11 is the MSB.
TEST CIRCUITS
Load Circuits for Access Time
Load Circuits for Output Float Delay
3k
C
L
C
L
DBN
(A) Hi-Z TO V
OH
, (t
3
)
AND V
OL
TO V
OH
, (t
6
)
(B) Hi-Z TO V
OL
, (t
3
)
AND V
OH
TO V
OL
, (t
6
)
DBN
3k
5V
1282 TC01
DGND
DGND
3k
10pF
10pF
DBN
(A) V
OH
TO Hi-Z
(B) V
OL
TO Hi-Z
DBN
3k
5V
1282 TC02
DGND
DGND
相關(guān)PDF資料
PDF描述
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