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AD668
REV. A
–10–
Figure 11. AD586 Driving the AD668
mode (Pin 22 grounded, input into Pin 21). Fine adjustment of
the gain is provided by both the AD586 external trim resistor
and the 100
potentiometer in series with the reference input.
The resistive divider at the reference input will draw approxi-
mately 1 mA from the AD586, leaving plenty of driving current
for other loads in the system.
AC HOOKUP: 1.25 V AC FULL SCALE, 2.5 V DC FULL
SCALE
The circuit shown in Figure 12 allows separate setting of dc ref-
erence bias point on a 2.5 V scale and capacitively coupled ac
signal on a 1.25 V scale. The basic reference input is configured
in the 1.25 V mode (Pin 21 grounded, Pin 22 used as the refer-
ence input.) The 2.5 V dc range is achieved by using an external
Table II. AD668 Topology Variations
OUTPUT LEVELS
Nominal
Analog
Input
0 V to 1 V
–500 mV to +500 mV
0 V to –10 V
+5 V to –5 V
–1 V to +1 V
Unipolar
Unbuffered V
OUT
A
IN
= Pins 21 + 22
Bipolar
Unbuffered V
OUT
A
IN
= Pins 21 + 22
Unipolar
Buffered V
OUT
A
IN
= Pins 21 + 22
External Amplifier
(See Figure 10)
Bipolar
Buffered V
OUT
A
IN
= Pins 21 + 22
External Amplifier
Bipolar
Unbuffered V
OUT
A
IN
= Pins 21 + 22
R
L
(Pin 19) Tied
To I
OUT
(Pin 20)
1 V
Unipolar
Unbuffered V
OUT
A
IN
= Pin 22
Pin 21 Grounded
Bipolar
Unbuffered V
OUT
A
IN
= Pin 22
Pin 21 Grounded
(See Figure 8)
Unipolar
Buffered V
OUT
A
IN
= Pin 22
Pin 21 Grounded
External Amplifier
Bipolar
Buffered V
OUT
A
IN
= Pin 22
Pin 21 Grounded
External Amplifier
Bipolar
Unbuffered V
OUT
A
IN
= Pin 22
Pin 21 Grounded
R
L
(Pin 19) Tied
To I
OUT
(Pin 20)
1.25 V
Unipolar
Unbuffered V
OUT
A
IN
= Pin 21
Pin 22 Grounded
(See Figure 7)
Bipolar
Unbuffered V
OUT
A
IN
= Pin 21
Pin 22 Grounded
Unipolar
Buffered V
OUT
A
IN
= Pin 21
Pin 22 Grounded
External Amplifier
Bipolar
Buffered V
OUT
A
IN
= Pin 21
Pin 22 Grounded
External Amplifier
Bipolar
Unbuffered V
OUT
A
IN
= Pin 21
Pin 22 Grounded
R
L
(Pin 19) Tied
To I
OUT
(Pin 20)
(See Figure 9)
5 V
5k series resistor in the dc path. Note that because of the rela-
tively wide tolerance (
±
20%) in the absolute value of the
AD668’s internal input divider resistors, substantial gain range
adjustment should be provided in the external series resistance.
Figure 12. AC Hookup
DAC DRIVE: THE AD568 DRIVING THE AD668
The circuit shown in Figure 13 produces an analog output pro-
portional to the product of two digital inputs. The AD568 has
an on-board fixed reference and generates a full-scale output
voltage of 1.024 V (just as the AD668 does in its unbuffered
voltage output mode). This output voltage can be used to di-
rectly drive the AD668 in the 1 V reference input mode. Note
that in this case, the lower 410 codes of the AD568 are out-of-
bounds; they produce an undervoltage condition at the AD668
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AD668JQ | 12-Bit Ultrahigh Speed Multiplying D/A Converter |
| AD669AN | Monolithic 16-Bit DACPORT |
| AD669AQ | Monolithic 16-Bit DACPORT |
| AD669AR | Monolithic 16-Bit DACPORT |
| AD669BN | Monolithic 16-Bit DACPORT |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD6680BST | 制造商:Analog Devices 功能描述: |
| AD6684-500EBZ | 功能描述:EVAL BOARD FOR AD6684 制造商:analog devices inc. 系列:- 零件狀態(tài):在售 類型:接收器 頻率:135MHz 配套使用產(chǎn)品/相關(guān)產(chǎn)品:AD6684 所含物品:板 標(biāo)準(zhǔn)包裝:1 |
| AD6684BCPZ-500 | 功能描述:RF QUAD RECEIVER 135MHZ 72LFCSP 制造商:analog devices inc. 系列:- 包裝:托盤 零件狀態(tài):在售 功能:接收器 頻率:135MHz RF 類型:GSM，LTE，W-CDMA 輔助屬性:- 封裝/外殼:72-VFQFN 裸露焊盤，CSP 供應(yīng)商器件封裝:72-LFCSP（10x10） 標(biāo)準(zhǔn)包裝:1 |
| AD6684BCPZRL7-500 | 功能描述:135 MHZ BW QUAD RECEIVER 制造商:analog devices inc. 系列:- 包裝:帶卷（TR） 零件狀態(tài):在售 功能:接收器 頻率:135MHz RF 類型:GSM，LTE，W-CDMA 輔助屬性:- 封裝/外殼:72-VFQFN 裸露焊盤，CSP 供應(yīng)商器件封裝:72-LFCSP（10x10） 標(biāo)準(zhǔn)包裝:400 |
| AD6688-3000EBZ | 功能描述:EVAL BD FOR AD6688-3000 制造商:analog devices inc. 系列:* 零件狀態(tài):在售 標(biāo)準(zhǔn)包裝:1 |
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