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參數(shù)資料
| 型號： | AD9070 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | RES., MF, 150 OHM, 1%, 1/4W |
| 中文描述： | 10位，100 MSPS的A / D轉(zhuǎn)換 |
| 文件頁數(shù)： | 10/16頁 |
| 文件大?。?/td> | 254K |
| 代理商： | AD9070 |
AD9070
–
10
–
REV. B
Figure 19 shows typical connections for the analog inputs when
using the AD9070 in a dc-coupled system with single-ended
signals. The AD820 is used to offset the ground referenced
input signal to the level required by the AD9070. A very high
performance amplifier, such as the AD9631, is required to avoid
degrading the analog signal presented to the ADC. A buffered
ac interface is easily implemented, with even fewer components
(Figure 20).
AD9070
V
EE
–
5V
GND
1k
R
T
V
IN
0.5V
AIN
AIN
VREF OUT
VREF IN
–
5V
–
5V
+5V
AD9631
350
AD820
1k
0.1 F
350
1k
0.1 F
0.1 F
Figure 19. DC-Coupled Input
AD9070
0.1 F
V
EE
–
5V
GND
350
R
T
V
IN
1Vp-p
AIN
AIN
VREF OUT
VREF IN
–
5V
+5V
AD9631
350
500
0.1 F
0.1 F
500
0.1 F
Figure 20. AC-Coupled Input
Special care was taken in the design of the analog input section
of the AD9070 to prevent damage and corruption of data when
the input is overdriven. The nominal input range is –1.988 V to
–3.012 V (1.024 V p–p centered at –2.5 V). Out-of-range
comparators detect when the analog input signal is out of this
range and set the OR output signal HIGH. The digital outputs
are locked at plus or minus full scale (1FFh or 200h) for
voltages that are out of range but between –1 V and –5 V. Input
voltages outside of this range may result in invalid codes at the
ADCs output.
When the analog input signal returns to the nominal range, the
out-of-range comparators return the ADC to its active mode
and the device recovers in approximately 3 ns.
The input is protected to one volt outside of the power supply
rails. For nominal power (–5 V and ground), the analog input
will not be damaged with signals ranging from –6.0 V to +1.0 V.
Voltage Reference
A stable and accurate –2.5 V voltage reference is built into the
AD9070 (VREF OUT) in the SOIC (BR) package. In normal
operation, the internal reference is used by strapping Pins 3
and 4 of the AD9070 together. The internal reference can
provide 100
μ
A of extra drive current that may be used for other
circuits.
Some applications may require greater accuracy, improved
temperature performance or adjustment of the gain of the
AD9070, which cannot be obtained by using the internal
reference. For these applications, an external –2.5 V reference
can be connected to VREF IN, which requires 5
μ
A of drive
current (Figure 21).
AD9070
V
EE
–
5V
GND
VREF OUT
VREF IN
–
5V
1.25k
0.1 F
NC
GND
+V
IN
V
OUT
AD780
Figure 21. Using the AD780 Voltage Reference
The input range can be adjusted by varying the reference
voltage applied to the AD9070. No appreciable degradation in
performance occurs when the reference is adjusted
±
4%. The
full-scale range of the ADC tracks reference voltage changes
linearly.
Timing
The performance of the AD9070 is insensitive to the duty cycle
of the clock over a wide range of operating conditions: pulse
width variations of as much as
±
20% will cause no degradation
in performance (see Figure 15).
The AD9070 provides latched data outputs, with three pipeline
delays. Data outputs are available one propagation delay (t
PD
)
after the rising edge of the encode command (Figure 1). The
length of the output data lines and loads placed on them should
be minimized to reduce transients within the AD9070; these
transients can detract from the converter’s dynamic performance.
The minimum guaranteed conversion rate of the AD9070 is
40 MSPS. At clock rates below 40 MSPS, dynamic performance
may degrade. The AD9070 will operate in bursts, but the user
must flush the internal pipeline each time the clock restarts.
Valid data will be produced on the fourth rising edge of the
ENCODE signal after the clock is restarted.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AD9070BR | 10-Bit, 100 MSPS A/D Converter |
| AD9071 | 10-Bit, 100 MSPS A/D Converter |
| AD9071BR | 10-Bit, 100 MSPS A/D Converter |
| AD9100AD | Ultrahigh Speed Monolithic Track-and-Hold |
| AD9100JD | Ultrahigh Speed Monolithic Track-and-Hold |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD9070/PCB | 制造商:AD 制造商全稱:Analog Devices 功能描述:10-Bit, 100 MSPS A/D Converter |
| AD9070BR | 制造商:Analog Devices 功能描述:ADC Single 100Msps 10-bit Parallel 28-Pin SOIC 制造商:Rochester Electronics LLC 功能描述:10BIT 100MSPS ECL ADC - Bulk |
| AD9070BR-REEL | 制造商:Analog Devices 功能描述:ADC Single 100Msps 10-bit Parallel 28-Pin SOIC T/R 制造商:Rochester Electronics LLC 功能描述:- Tape and Reel |
| AD9070TD | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog-to-Digital Converter， 10-Bit |
| AD9071 | 制造商:AD 制造商全稱:Analog Devices 功能描述:10-Bit, 100 MSPS A/D Converter |
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