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AD13465BZ 数据表(PDF) 9 Page - Analog Devices

部件名 AD13465BZ
功能描述  Dual Channel, 14-Bit, 65 MSPS A/D Converter with Analog Input Signal Conditioning
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制造商  AD [Analog Devices]
网页  http://www.analog.com
标志 AD - Analog Devices

AD13465BZ 数据表(HTML) 9 Page - Analog Devices

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REV. 0
AD13465
–9–
AMP-IN-X-1
100
100
TO AD8037
AMP-IN-X-2
Figure 2. Single-Ended Input Stage
LOADS
LOADS
ENCODE
10k
10k
ENCODE
AVCC
10k
10k
AVCC
AVCC
AVCC
Figure 3. ENCODE Inputs
CURRENT MIRROR
CURRENT MIRROR
DR OUT
DVCC
VREF
DVCC
Figure 4. Digital Output Stage
CURRENT MIRROR
CURRENT MIRROR
D0–D13
100
DVCC
VREF
DVCC
Figure 5. Digital Output Stage
THEORY OF OPERATION
The AD13465 is a high-dynamic range, 14-bit, 65 MHz pipe-
line delay (three pipelines) analog-to-digital converter. The
custom analog input section provides input ranges of 1 V p-p and
2 V p-p, and input impedance configurations of 50
Ω, 100 Ω,
and 200
Ω.
The AD13465 employs four monolithic ADI components per
channel (AD8037, AD8138, AD8031, and AD6644), along
with multiple passive resistor networks and decoupling capacitors
to fully integrate a complete 14-bit analog-to-digital converter.
In the single-ended input configuration, the input signal is
passed through a precision laser trimmed resistor divider allowing
the user to externally select operation with a full-scale signal of
±0.5 V or ±1.0 V by choosing the proper input terminal for the
application. The result of the resistor divider is to apply a full-scale
input approximately 0.4 V to the noninverting input of the
internal AD8037 amplifier.
The AD13465 analog input includes an AD8037 amplifier
featuring an innovative architecture that maximizes the dynamic
range capability on the amplifier’s inputs and outputs. The
AD8037 amplifier provides a high-input impedance and gain for
driving the AD8138 in a single-ended-to-differential amplifier
configuration. The AD8138 has a –3 dB bandwidth at 300 MHz
and delivers a differential signal with the lowest harmonic
distortion available in a differential amplifier. The AD8138
differential outputs help balance the differential inputs to the
AD6644 maximizing the performance of the device.
The AD8031 provides the buffer for the internal reference
analog-to-digital converter. The internal reference voltage of the
AD6644 is designed to track the offsets and drifts and is used to
ensure matching over an extended temperature range of opera-
tion. The reference voltage is connected to the output common
mode input on the AD8138. This reference voltage sets the
output common mode on the AD8138 at 2.4 V, which is the
midsupply level for the ADC.
The AD6644 has complementary analog input pins, AIN and
AIN. Each analog input is centered at 2.4 V and should swing
± 0.55 V around this reference. Since AIN and AIN are 180
degrees out of phase, the differential analog input signal is 2.2 V
peak-to-peak. Both analog inputs are buffered prior to the first
track-and-hold.
The AD6644 digital outputs drive 100
Ω series resistors (Figure
5.) The result is a 14-bit parallel digital CMOS-compatible
word, coded as two’s complement.
USING THE SINGLE-ENDED INPUT
The AD13465 has been designed with the user’s ease of opera-
tion in mind. Multiple input configurations have been included
on board to allow the user a choice of input signal levels and
input impedance. The standard inputs are
±0.5 V and ±1.0 V.
The user can select the input impedance of the AD13465 on
any input by using the other inputs as alternate locations for the
GND. The following chart summarizes the impedance options
available at each input location.
AMP-IN-X-1 = 100
Ω when AMP-IN-X-2 is open.
AMP-IN-X-1 = 50
Ω when AMP-IN-X-2 is shorted to GND.
AMP-IN-X-2 = 200
Ω when AMP-IN-X-1 is open.
Each channel has two analog inputs AMP-IN-A-1 and AMP-
IN-A-2 or AMP-IN-B-1 and AMP-IN-B-2. Use AMP-IN-A-1


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