TA = –40 CTA = –55 C Parameter
參數(shù)資料
型號： AD7628KP-REEL
廠商： Analog Devices Inc
文件頁數(shù)： 2/8頁
文件大小： 0K
描述： IC DAC 8BIT DUAL W/BUFF 20-PLCC
產(chǎn)品培訓(xùn)模塊： Data Converter Fundamentals
DAC Architectures
標(biāo)準(zhǔn)包裝： 1,000
設(shè)置時間： 400ns
位數(shù)： 8
轉(zhuǎn)換器數(shù)目： 2
電壓電源： 單電源
功率耗散（最大）： 450mW
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 20-LCC（J 形引線）
供應(yīng)商設(shè)備封裝： 20-PLCC（9x9）
包裝： 帶卷 (TR)
輸出數(shù)目和類型： 2 電流，單極；2 電流，雙極
采樣率（每秒）： 2.9M
TA = –40 CTA = –55 C
Parameter
TA = +25 C
1
to +85 C
to +125 C
1
Units
Test Conditions/Comments
STATIC PERFORMANCE
2
Resolution
8
Bits
Relative Accuracy
± 1/2
LSB max
This is an Endpoint Linearity Specification
Differential Nonlinearity
± 1
± l
LSB max
All Grades Guaranteed Monotonic Over
Full Operating Temperature Range
Gain Error
± 2
± 3
LSB max
Measured Using Internal RFB A and RFB B.
Both DAC Latches Loaded with 11111111.
Gain Error is Adjustable Using Circuits
of Figures 4 and 5.
Gain Temperature Coefficient
3
Gain/Temperature
± 0.0035
%/
°C max
Output Leakage Current
OUT A (Pin 2)
± 50
± 200
nA max
DAC Latches Loaded with 00000000
OUT B (Pin 20)
± 50
± 200
nA max
Input Resistance (VREFA, VREFB)
88
8k
min
Input Resistance TC = –300 ppm/
°C, Typical
15
k
max
Input Resistance is 11 k
VREFA/VREFB Input Resistance
Match
± 1
% max
DIGITAL INPUTS
4
Input High Voltage (VIH)
2.4
V min
Input Low Voltage (VIL)
0.8
V max
Input Current (IIN)
± 1
± 10
A max
VIN = 0 or VDD
Input Capacitance
DB0–DB7
10
pF max
WR, CS, DACA/DACB
15
pF max
SWITCHING CHARACTERISTICS
3
See Timing Diagram
Chip Select to Write Set Up Time (tCS)
160
210
ns min
Chip Select to Write Hold Time (tCH)
10
ns min
DAC Select to Write Set Up Time (tAS)
160
210
ns min
DAC Select to Write Hold Time (tAH)
10
ns min
Data Valid to Write Set Up Time (tDS)
160
210
ns min
Data Valid to Write Hold Time (tDH)
10
ns min
Write Pulse Width (tWR)
150
170
210
ns min
POWER SUPPLY
See Figure 3
IDD, K Grade
2
mA
All Digital Inputs VIL or VIH
B, T Grades
2
2.5
mA
All Digital Inputs VIL or VIH
All Grades
100
500
A
All Digital Inputs 0 V or VDD
Specifications subject to change without notice.
AC PERFORMANCE CHARACTERISTICS
TA = –40 CTA = –55 C
Parameter
TA = +25 C
1
to +85 C
1
to +125
πC1
Units
Test Conditions/Comments
DC SUPPLY REJECTION
(
GAIN/V
DD)
0.01
0.02
% per % max
V
DD = ± 5%
CURRENT SETTLING TIME
350
400
ns max
To 1/2 LSB OutA/OutB Load = 100
.
WR = CS = 0 V.
DB0–DB7 = 0 V to VDD or VDD to 0 V
DIGITAL-TO-ANALOG GLITCH
IMPULSE
330
nV sec typ
For Code Transition 00000000 to 11111111
OUTPUT CAPACITANCE
COUTA
25
pF max
DAC Latches Loaded with 00000000
COUTB
25
pF max
COUTA
60
pF max
DAC Latches Loaded with 11111111
COUTB
60
pF max
AC FEEDTHROUGH
VREFA to OUT A
–70
–65
dB max
VREFA, VREFB = 20 V p-p Sine Wave
VREFB to OUT B
–70
–65
dB max
@ 10 kHz
CHANNEL-TO-CHANNEL ISOLATION
Both DAC Latches Loaded with 11111111.
VREFA to OUT B
–80
dB typ
VREFA = 20 V p-p Sine Wave @ 10 kHz
VREFB = 0 V See Figure 6.
VREFB to OUTA
–80
dB typ
VREFB = 20 V p-p Sine Wave @ 10 kHz
VREFA = 0 V See Figure 6.
DIGITAL CROSSTALK
60
nV sec typ
Measured for Code Transition 00000000
to 11111111
HARMONIC DISTORTION
–85
dB typ
VIN = 6 V rms @ 1 kHz
NOTES
1Temperature Ranges are K Version; –40
°C to +85°C; B Version; –40°C to +85°C; T Version; –55°C to +125°C.
2Specification applies to both DACs in AD7628.
3Guaranteed by design but not production tested.
4Logic inputs are MOS Gates. Typical input current (+25
°C) is less than 1 nA.
Specifications subject to change without notice.
REV. A
–2–
AD7628–SPECIFICATIONS
(VDD = +10.8 V to +15.75 V, VREF A = VREF B = +10 V; OUT A = OUT B = 0 V unless
otherwise noted)
These characteristics are included for Design Guidance only and are not
subject to test. VDD = +10.8 V to +15.75 V. (Measured Using Recommended PC Board Layout (Figure 7) and AD644 as Output Amplifiers)
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