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參數資料
| 型號： | AD9701SQ |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | DAC |
| 英文描述： | 250 MSPS Video Digital-to-Analog Converter |
| 中文描述： | PARALLEL, 8 BITS INPUT LOADING, 0.012 us SETTLING TIME, 8-BIT DAC, CDIP22 |
| 封裝： | CERDIP-22 |
| 文件頁數： | 4/6頁 |
| 文件大小： | 127K |
| 代理商： | AD9701SQ |
AD9701
–4–
REV. A
FUNCT IONAL DE SCRIPT ION
Pin Name
GROUND
–V
S
BIT 1 (MSB)
BIT 2–BIT 7
BIT 8 (LSB)
ST ROBE
GROUND
SET UP
Description
One of three ground returns. All grounds should be connected together near the AD9701.
Negative supply pin, nominally –5.2 V.
One of eight digital input bits. BIT 1 (MSB) is the most-significant-bit of the digital input word.
One of eight digital input bits.
One of eight digital input bits. BIT 8 (LSB) is the least-significant-bit of the digital input word.
Data and control register strobe input. ST ROBE is leading edge triggered.
One of three ground returns. All grounds should be connected together near the AD9701.
T he SET UP input determines the position of the blanking level relative to the “reference black”
level (all data bits at logic “0”). T he setup level is adjustable from 0 IRE units to 20 IRE units be-
low the reference black level (an IRE unit is 1% of the “grey scale” range).
SE T UP LE VE L
0 IRE Units
7.5 IRE Units
10 IRE Units
20 IRE Units
CONFIGURAT ION (PIN 21)
Ground
Open
Connection to –5.2 V through 1 k
Connection to –5.2 V
10% BRIGHT
10% BRIGHT
adds an additional current to the output level, equal to roughly 10% of the “grey
scale” range. T he
10% BRIGHT
is active logic LOW and operates independently of all other inputs.
T he
COMPOSITE BLANKING
input, active logic LOW, forces output to the blanking level set
with the SET UP input.
T he
COMPOSITE SYNC
input, active LOW, creates a negative going horizontal synchronization
pulse relative to the blanking level. Under normal operating conditions, the
COMPOSITE
BLANKING
signal should precede and extend past the
COMPOSITE SYNC
signal. See SET UP
for additional information.
T he
REFERENCE WHITE
input, active LOW, overrides the data inputs and forces the output to
the maximum “grey scale” level.
T he COMPENSAT ION input insures adequate gain stability for the internal reference amplifier.
Under normal operating conditions, the COMPENSAT ION input is decoupled to ground through
a 0.1
μ
F capacitor.
T he CURRENT SET input determines the full-scale or “grey scale” range. T he effects of the video
control functions are in addition to the “grey scale” range. (168
≤
R
SET
≤
600
).
I
OUT max
≈
4 I
SET
= 4(1.26 V/R
SET
)
Analog output.
One of three ground returns. All grounds should be connected together near the AD9701.
COMPOSITE BLANKING
COMPOSITE SYNC
REFERENCE WHITE
COMPENSAT ION
CURRENT SET
OUT PUT
GROUND
SY ST E M T IMING DIAGRAMS
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