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參數(shù)資料
| 型號(hào)： | AD8189Z-EVALZ |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 350 MHz Single-Supply (5 V) Triple 2:1 Multiplexers |
| 中文描述： | 350兆赫單電源（5V）的三重2:1多路復(fù)用器 |
| 文件頁數(shù)： | 15/24頁 |
| 文件大小： | 725K |
| 代理商： | AD8189Z-EVALZ |
AD8188/AD8189
Rev. 0 | Page 15 of 24
IN0A
IN0B
IN1B
IN1A
IN2A
IN2B
OUT0
OUT1
OUT2
AD8188
MUX SYSTEM
“C_BYPASS”
V
REF
INTERNAL CAP
BIAS REFERENCE
DIRECT CONNECTION TO ANY “QUIET” AC GROUND
(FOR EXAMPLE, GND, V
CC
, AND V
EE
).
0
Figure 45. V
REF
Pin Connection for AD8188 (Differs from AD8189)
The AD8189
The AD8189 uses on-chip feedback resistors to realize the gain-
of-two function. To provide low crosstalk and a high output
impedance when disabled, each set of 500 Ω feedback resistors
is terminated by a dedicated reference buffer. A reference buffer
is a high speed op amp configured as a unity-gain follower. The
three reference buffers, one for each channel, share a single,
high impedance input, the V
REF
pin (see Figure 46). V
REF
input
bias current is typically less than 2 μA.
OUT1
OUT0
OUT2
A0
B0
V
REF
5V
5V
5V
GBUF 0
5V
GBUF 1
5V
GBUF 2
500
500
500
500
500
500
VF-2
VF-1
1×
VFO
0
Figure 46. Conceptual Diagram of a Single Multiplexer Channel, G = 2
This configuration has a few implications for single-supply
operation:
On the AD8189, V
REF
cannot be tied to the most negative
analog supply, V
EE
. The limits on reference voltage are (see
Figure 47):
V
EE
+ 1.3 V <
V
REF
×
V
CC
1.6 V
1.3 V <
V
REF
,
3.4 V on 0 V/5 V supplies
A0
V
REF
5V
5V
OUT0
5V
V
O_MAX
= 3.7V
V
O_MIN
= 1.3V
V
O_MIN
= 1.3V
V
O_MAX
= 3.4V
5V
1.3V
1.3V
1.3V
1.6V
GND
GND
V
OUT
V
REF
0
Figure 47. Output Compliance of Main Amplifier Channel and Ground Buffer
The signal at the V
REF
pin appears at each output.
Therefore, V
REF
should be tied to a well bypassed, low
impedance source. Using superposition, it is shown that
V
OUT
= 2 ×
V
IN
V
REF
To maximize the output dynamic range, the reference
voltage should be chosen with care. For example, consider
amplifying a 700 mV video signal with a sync pulse
300 mV below black level. If the user decides to set V
REF
at
black level to preferentially run video signals on the faster
NPN transistor path, the AD8189 allows a reference
voltage as low as 1.3 V + 300 mV = 1.6 V. If the AD8189 is
used, the sync pulse is amplified to 600 mV. Therefore, the
lower limit on V
REF
becomes 1.3 V + 600 mV = 1.9 V. For
routing RGB video, an advantageous configuration is to
employ +3 V and 2 V supplies, in which case V
REF
can be
tied to ground.
If system considerations prevent running the multiplexer on
split supplies, a false ground reference should be employed. A
low impedance reference can be synthesized with a second
operational amplifier. Alternately, a well bypassed resistor
divider can be used. Refer to the Applications section for
further explanation and more examples.
V
REF
0.022μF
5V
GND
OP21
100k
10k
100
FROM 1992 ADI AMPLIFIER
APPLICATIONS GUIDE
1μF
1μF
0
Figure 48. Synthesis of a False Ground Reference
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