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AD6641 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer AD6641
Beschreibung 250 MHz Bandwidth DPD Observation Receiver
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 28 Seiten
AD6641 Datasheet, Funktion
www.DataSheet4U.net
250 MHz Bandwidth
DPD Observation Receiver
AD6641
FEATURES
GENERAL DESCRIPTION
SNR = 65.8 dBFS at fIN up to 250 MHz at 500 MSPS
ENOB of 10.5 bits at fIN up to 250 MHz at 500 MSPS (−1.0 dBFS)
SFDR = 80 dBc at fIN up to 250 MHz at 500 MSPS (−1.0 dBFS)
Excellent linearity
DNL = ±0.5 LSB typical, INL = ±0.6 LSB typical
Integrated 16k × 12 FIFO
FIFO readback options
12-bit parallel CMOS at 62.5 MHz
6-bit DDR LVDS interface
SPORT at 62.5 MHz
SPI at 25 MHz
High speed synchronization capability
1 GHz full power analog bandwidth
Integrated input buffer
On-chip reference, no external decoupling required
Low power dissipation
695 mW at 500 MSPS
Programmable input voltage range
1.18 V to 1.6 V, 1.5 V nominal
1.9 V analog and digital supply operation
1.9 V or 3.3 V SPI and SPORT operation
Clock duty cycle stabilizer
Integrated data clock output with programmable clock and
data alignment
The AD6641 is a 250 MHz bandwidth digital predistortion
(DPD) observation receiver that integrates a 12-bit 500 MSPS
ADC, a 16k × 12 FIFO, and a multimode back end that allows
users to retrieve the data through a serial port (SPORT), the SPI
interface, a 12-bit parallel CMOS port, or a 6-bit DDR LVDS
port after being stored in the integrated FIFO memory. It is opti-
mized for outstanding dynamic performance and low power
consumption and is suitable for use in telecommunications
applications such as a digital predistortion observation path
where wider bandwidths are desired. All necessary functions,
including the sample-and-hold and voltage reference, are
included on the chip to provide a complete signal conversion
solution.
The on-chip FIFO allows small snapshots of time to be captured
via the ADC and read back at a lower rate. This reduces the
constraints of signal processing by transferring the captured
data at an arbitrary time and at a much lower sample rate. The
FIFO can be operated in several user-programmable modes. In
the single capture mode, the ADC data is captured when sig-
naled via the SPI port or the use of the external FILL± pins. In
the continuous capture mode, the data is loaded continuously
into the FIFO and the FILL± pins are used to stop this operation.
APPLICATIONS
Wireless and wired broadband communications
Communications test equipment
Power amplifier linearization
FUNCTIONAL BLOCK DIAGRAM
FILL+ FILL– DUMP
CLK+
CLK–
VIN+
VIN–
CLOCK AND CONTROL
ADC
FIFO
16k × 12
PARALLEL
AND
SPORT
OUTPUTS
SPI CONTROL
REFERENCE AND DATA
VREF SCLK, SDIO, AND CSB
Figure 1.
PCLK+
PCLK–
PD[5:0]± IN DDR LVDS MODE
OR PD[11:0] IN CMOS MODE
SP_SCLK
SP_SDFS
SP_SDO
FULL
EMPTY
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2011 Analog Devices, Inc. All rights reserved.






AD6641 Datasheet, Funktion
AD6641
DIGITAL SPECIFICATIONS
AVDD = 1.9 V, DRVDD = 1.9 V, TMIN = −40°C, TMAX = +85°C, fIN = −1.0 dBFS, full scale = 1.5 V, unless otherwise noted.
Table 3.
Parameter1
CLOCK INPUTS (CLK±)
Logic Compliance
Internal Common-Mode Bias
Differential Input Voltage
High Level Input (VIH)
Low Level Input (VIL)
High Level Input Current (IIH)
Low Level Input Current (IIL)
Input Resistance (Differential)
Input Capacitance
LOGIC INPUTS (SPI, SPORT)
Logic Compliance
Logic 1 Voltage
Logic 0 Voltage
Logic 1 Input Current (SDIO)
Logic 0 Input Current (SDIO)
Logic 1 Input Current (SCLK)
Logic 0 Input Current (SCLK)
Input Capacitance
LOGIC INPUTS (DUMP, CSB)
Logic Compliance
Logic 1 Voltage
Logic 0 Voltage
Logic 1 Input Current
Logic 0 Input Current
Input Capacitance
LOGIC INPUTS (FILL±)
Logic Compliance
Internal Common-Mode Bias
Differential Input Voltage
High Level Input (VIH)
Low Level Input (VIL)
High Level Input Current (IIH)
Low Level Input Current (IIL)
Input Resistance (Differential)
Input Capacitance
LOGIC OUTPUTS2 (FULL, EMPTY)
Logic Compliance
High Level Output Voltage
Low Level Output Voltage
LOGIC OUTPUTS2 (SPI, SPORT)
Logic Compliance
High Level Output Voltage
Low Level Output Voltage
Temp Min
AD6641-500
Typ Max
Full CMOS/LVDS/LVPECL
Full 0.9
Full 0.2
Full −1.8
Full −10
Full −10
Full 8
Full
1.8
−0.2
+10
+10
10 12
4
Full
Full 0.8 × SPI_VDDIO
Full
Full
Full
Full
Full
25°C
CMOS
0.2 × SPI_VDDIO
0
−60
50
0
4
Full
Full 0.8 × DRVDD
Full
Full
Full
25°C
CMOS
0.2 × DRVDD
0
−60
4
Full CMOS/LVDS/LVPECL
Full 0.9
Full 0.2
Full −1.8
Full −10
Full −10
Full 8
Full
1.8
−0.2
+10
+10
10 12
4
Full
Full DRVDD − 0.05
Full
CMOS
DRGND + 0.05
Full
Full SPI_VDDIO − 0.05
Full
CMOS
DRGND + 0.05
Unit
V
V p-p
V p-p
μA
μA
pF
V
V
μA
μA
μA
μA
pF
V
V
μA
μA
pF
V
V p-p
V p-p
μA
μA
pF
V
V
V
V
Rev. 0 | Page 6 of 28

6 Page









AD6641 pdf, datenblatt
AD6641
Pin No.
40
44
45
49
50
51
52
53
55
56
Mnemonic
CML
CLK+
CLK−
FILL+
FILL−
FULL
EMPTY
DUMP
PCLK−
PCLK+
Description
Common-Mode Output. Enabled through the SPI, this pin provides a reference for the optimized
internal bias voltage for VIN+ and VIN−.
Clock Input—True.
Clock Input—Complement.
FIFO Fill Input (LVDS)—True.
FIFO Fill Input (LVDS)—Complement.
FIFO Full Output Indicator.
FIFO Empty Output Indicator.
FIFO Readback Input.
Data Clock Output—Complement.
Data Clock Output—True.
Rev. 0 | Page 12 of 28

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