參數(shù)資料
型號： AD7821TQ
廠商： ANALOG DEVICES INC
元件分類： ADC
英文描述： LC2MOS High Speed, mP-Compatible 8-Bit ADC with Track/Hold Function
中文描述： 1-CH 8-BIT FLASH METHOD ADC, PARALLEL ACCESS, CDIP20
封裝： SKINNY, HERMETIC SEALED, CERDIP-20
文件頁數(shù)： 2/12頁
文件大?。?/td> 249K
代理商： AD7821TQ
REV. A
–2–
AD7821–SPECIFICATIONS
V
REF
(–) = –2.5 V. These test conditions apply unless otherwse stated. All specifications T
MN
to T
MAX
unless otherwse noted. Specifications
apply for RD Mode (Pin 7 = 0 V).
V
DD
= +5 V
6
5%, GND = 0 V. Unipolar Input Range: V
SS
= GND V
REF
(+) = 5 V,
V
REF
(–) = GND. Bipolar Input Range: V
SS
= –5 V
6
5%, V
REF
(+) = 2.5 V,
Parameter
K Version
1
B, T Versions
Units
Comments
UNIPOLAR INPUT RANGE
Resolution
2
T otal Unadjusted Error
3
Minimum Resolution for which
No Missing Codes are Guaranteed
8
±
1
8
±
1
Bits
LSB max
8
8
Bits
BIPOLAR INPUT RANGE
Resolution
Zero Code Error
Full Scale Error
Signal-to-Noise Ratio (SNR)
3
T otal Harmonic Distortion (T HD)
3
Peak Harmonic or Spurious Noise
3
Intermodulation Distortion (IMD)
3
8
±
1
±
1
45
–50
–50
8
±
1
±
1
45
–50
–50
Bits
LSB max
LSB max
dB min
dB max
dB max
V
IN
= 99.85 kHz Full-Scale Sine Wave with f
SAMPLING
= 500 kHz
V
IN
= 99.85 kHz Full-Scale Sine Wave with f
SAMPLING
= 500 kHz
V
= 99.85 kHz Full-Scale Sine Wave with f
= 500 kHz
fa (84.72 kHz) and fb (94.97 kHz) Full-Scale Sine Waves
with f
= 500 kHz
Second Order T erms
T hird Order T erms
–50
–50
1.6
2.36
–50
–50
1.6
2.36
dB max
dB max
V/
μ
s max
V/
μ
s typ
Slew Rate, T racking
3
REFERENCE INPUT
Input Resistance
V
REF
(+) Input Voltage Range
V
REF
(–) Input Voltage Range
1.0/4.0
V
REF
(–)/V
DD
V
SS
/V
REF
(+)
1.0/4.0
V
REF
(–)/V
DD
V
SS
/V
REF
(+)
k
min/k
max
V min/V max
V min/V max
ANALOG INPUT
Input Voltage Range
Input Leakage Current
Input Capacitance
V
REF
(–)/V
REF
(+)
±
3
55
V
REF
(–)/V
REF
(+)
±
3
55
V min/ max
μ
A max
pF typ
–5 V
≤
V
IN
≤
+5 V
LOGIC INPUT S
CS
,
WR
,
RD
V
INH
V
INL
I
INH
(
CS
,
RD
)
I
INH
(
WR
)
I
Input Capacitance
4
MODE
V
INH
V
INL
I
INH
I
Input Capacitance
4
2.4
0.8
1
3
–1
8
2.4
0.8
1
3
–1
8
V min
V max
μ
A max
μ
A max
μ
A max
pF max
T ypically 5 pF
3.5
1.5
200
–1
8
3.5
1.5
200
–1
8
V min
V max
μ
A max
μ
A max
pF max
50
μ
A typ
T ypically 5 pF
LOGIC OUT PUT S
DB0–DB7,
OFL
,
INT
V
OH
V
OL
I
(DB0–DB7)
Output Capacitance
4
(DB0–DB7)
RDY
V
OL
I
Output Capacitance
4
4.0
0.4
±
3
8
4.0
0.4
±
3
8
V min
V max
μ
A max
pF max
I
SOURCE
= 360
μ
A
I
Floating State Leakage
T ypically 5 pF
0.4
±
3
8
0.4
±
3
8
V max
μ
A max
pF max
I
= 2.6 mA
Floating State Leakage
T ypically 5 pF
POWER SUPPLY
I
DD5
I
SS
Power Dissipation
Power Supply Sensitivity
15
100
50
±
1/4
20
100
50
±
1/4
mA max
μ
A max
mW typ
LSB max
CS
=
RD
= 0 V
CS
=
RD
= 0 V
±
1/16 LSB typ, V
DD
= 4.75 V to 5.25 V,
(V
REF
(+) = 4.75 V max for Unipolar Mode)
NOT ES
1
T emperature Ranges are as follows: K Version = –40
°
C to +85
°
C; B Version = –40
°
C to +85
°
C; T Version = –55
°
C to +125
°
C.
2
1 LSB = 19.53 mV for both the unipolar (0 V to +5 V) and bipolar (–2.5 V to +2.5 V) input ranges.
3
See T erminology.
4
Sample tested at +25
°
C to ensure compliance.
5
See T ypical Performance Characteristics.
Specifications subject to change without notice.
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