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參數(shù)資料
| 型號(hào)： | SP9840KN |
| 英文描述： | 8-Bit Octal, 4-Quadrant Multiplying, BiCMOS DAC |
| 中文描述： | 8位八路，4象限乘法，BiCMOS工藝援 |
| 文件頁(yè)數(shù)： | 5/10頁(yè) |
| 文件大小： | 134K |
| 代理商： | SP9840KN |
261
Pin 9 — V
OUT
F — DACF Voltage Output.
Pin 10 — V
OUT
G — DACG Voltage Output.
Pin 11 — V
OUT
H — DACH Voltage Output.
Pin 12 — V
IN
G/H — DACG and H Reference Voltage
Input.
Pin 13 — LOADH — Load DAC Register Strobe;
active high input that transfers the data bits from the
Serial Input Register into the decoded DAC Register.
Refer to Table 1.
Pin 14 — CLOCK — Serial Clock Input; positive-edge
triggered.
Pin 15 — SDO — Serial Data Output; active totem-pole
output.
Pin 16 — GND — Ground.
Pin 17 — SDI — Serial Data Input.
Pin 18 — V
DD
— Positive 5V Power Supply.
Pin 19 — V
IN
C/D — DACC and D Reference Voltage
Input.
Pin 20 — V
OUT
D — DACD Voltage Output.
SP9840/SP9843
Theory of Operation
Each of the eight channels of the
SP9840/9843
can be used for signal reconstruction, as a pro-
grammable DC source, or as a programmable
signed attenuator of –1 to +0.992 times a multi-
plying AC reference input. The rugged wideband
output amplifiers provide both current sink and
source capability to DC applications, even into
difficult loads. The DC source mode mimics the
functionality of a programmable trimpot, with
the added benefit of a low–impedance buffered
output. The amplifier's bandwidth and high open
loop gain allow use in programmable signed
attenuator applications where even low–distor-
tion, high resolution signals, such as audio, must
be gated on and off, programmable phase shifted
by 0
°
or 180
°
or gain controlled over a –42 to
0dB range at either phase.
Each channel consists of a voltage–output DAC,
realized using CMOS switches and thin–film
resistors in an inverted R–2R configuration.
Each DAC drives the positive terminal of an op
amp, configured for a gain of –1 to +1 using
equal value thin–film feedback and gain–setting
resistors. Signal return is the V
pin, the
common reference input return for the eight
DAC–op amp channels.
As shown in
Figure 1
, the DAC section can be
thought of as a potentiometer across V
(X) to
V
. If this potentiometer is set to its minimum
value of 0/256, the potentiometer will have no
effect on the gain, and the output will be –R
/R
IN
= –1 times the input. If the potentiometer could
be set to 256/256, then the amplifier positive
terminal would see 100% of any input and no
current would flow through R
. The circuit
would behave as a non–inverting unity gain
circuit, although with a noise gain of two, not
one. In reality, the "potentiometer" can only be
set to 255/256, and the maximum positive gain
is 0.992 times the voltage between V
IN
(X) and
V
REFL
.
The true relation between the DC levels at the
V
(X) pins, V
REF
L and the output can be de-
scribed as:
=
(
128
F1
where D is programmable from 0 to 255.
For single supply operation V
is usually
externally driven to some voltage above ground
— typically 1.5 to 2.5V. IF V
is driven to
1.5V, and V
(X) is grounded, then code 0
would output +3.0V, and code 255 would output
+11.7mV. If V
were grounded and V
(X)
driven to 1.5V, then codes between 0 and 128
would attempt to drive the output below ground,
which will saturate the output amplifier at some
voltage slightly above ground.
V
D
V
(
V
V
OUT
IN
REFL
REFL
)
(
)
)
+
1
USING THE SP9840/9843
Multiplication of Input Voltages
While both the
SP9840
and
SP9843
are capable of
four–quadrant multiplication, this terminology is not
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SP9840KS | 8-Bit Octal, 4-Quadrant Multiplying, BiCMOS DAC |
| SP9843 | 8-Bit Octal, 4-Quadrant Multiplying, BiCMOS DAC |
| SP9843BS | 8-Bit Octal, 4-Quadrant Multiplying, BiCMOS DAC |
| SP9843KS | 8-Bit Octal, 4-Quadrant Multiplying, BiCMOS DAC |
| SP9841 | 8-Bit Octal, 2-Quadrant Multiplying, BiCMOS DAC |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SP9840KS | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:8-Bit Octal, 4-Quadrant Multiplying, BiCMOS DAC |
| SP9841 | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:8-Bit Octal, 2-Quadrant Multiplying, BiCMOS DAC |
| SP9841BN | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:8-Bit Octal, 2-Quadrant Multiplying, BiCMOS DAC |
| SP9841BS | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:8-Bit Octal, 2-Quadrant Multiplying, BiCMOS DAC |
| SP9841KN | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:8-Bit Octal, 2-Quadrant Multiplying, BiCMOS DAC |
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