AFE8201PFBR BURR-BROWN [Burr-Brown Corporation], AFE8201PFBR Datasheet

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AFE8201PFBR

Manufacturer Part Number
AFE8201PFBR
Description
IF Analog-to-Digital Converter with Digital Downconverter
Manufacturer
BURR-BROWN [Burr-Brown Corporation]
Datasheet
FEATURES
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APPLICATIONS
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PRODUCT PREVIEW information concerns products in the formative or design
phase of development. Characteristic data and other specifications are design
goals. Texas Instruments reserves the right to change or discontinue these
products without notice.
All trademarks are the property of their respective owners.
AUX
IFM
IFP
12-BIT, 80MSPS ADC
INTEGRATED DIGITAL DOWNCONVERTER (DDC):
Quadrature Mixer/NCO
CIC Decimation Filter
FIR Filters
MIXER: 32-BIT FREQUENCY AND PHASE
DECIMATION RATIO: 32 to 4096
USER PROGRAMMABLE FIR FILTERS WITH
16-BIT COEFFICIENTS
12-BIT AUXILIARY DAC
DATA INTERFACE COMPATIBLE WITH TI C5x/C6x
DSP BUFFERED SERIAL PORT (McBSP):
Code Composer Module for Easy Software
Generation
SPI CONTROL INTERFACE
3.3V ANALOG, 1.8V DIGITAL SUPPLY
1.8V to 3.3V I/O SUPPLY
TQFP-48
SOFTWARE RADIOS
IF RECEIVE CHANNEL
DIGITAL RADIO RECEIVERS
NARROWBAND RECEIVERS
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments
semiconductor products and disclaimers thereto appears at the end of this data sheet.
Auxiliary
DAC
REFM VCM REFP VGB
Pipeline
12− Bit
ADC
Reference
IF Analog-to-Digital Converter
Voltage
with Digital Downconverter
Quadrature
Mixer
NCO
MCLK
Interface
Clock
MCLKB
CIC Filter
www.ti.com
N
PWD
Generator
DESCRIPTION
The AFE8201 consists of a general-purpose, 80MSPS,
12-bit analog-to-digital converter (ADC), a digital
downconverter (DDC), and user-programmable digital
filters. It is designed to sample narrowband (2.5MHz or
less) IF signals and digitally mix, filter, and decimate the
signals to baseband.
The DDC consists of a digital quadrature mixer followed
by a CIC decimation filter and FIR filters. The mixer
frequency and initial phase are independently
programmed by 32-bit control words.
After the CIC filter, the internal I and Q signals are
passed on to the first FIR filter, which can implement
even, odd, halfband, and arbitrary impulse responses
with up to 62 taps using 16-bit coefficients.
Following the first FIR filter are two parallel FIR filters
that can be used to provide two output streams or
interleaved to form one extended filter with up to 262
taps.
general-purpose auxiliary digital-to-analog converter
(DAC) for applications such as AGC amplifier control.
Control register data as well as decimation filter
coefficients are written to the AFE8201 through the
industry-standard SPI control interface. The baseband
output signals are transported through a general-
purpose, high-speed serial interface that is compatible
with TI C5x/C6x DSP family buffered serial ports
(McBSP).
SYNC RST_N
Timing
FIR Filter 1
The
2
SBWS016A − OCTOBER 2003 − REVISED JANUARY 2005
Copyright  2003−2005, Texas Instruments Incorporated
AFE8201
SCK MOSI MISO CS_N
SPI Control
FIR Filter 2B
FIR Filter 2A
Interface
2
2
also
contains
AFE8201
a
DOUT0
DOUT1
DFSO
DCLK
DIN
DFSI
12-bit

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AFE8201PFBR Summary of contents

Page 1

IF Analog-to-Digital Converter with Digital Downconverter FEATURES D 12-BIT, 80MSPS ADC D INTEGRATED DIGITAL DOWNCONVERTER (DDC): Quadrature Mixer/NCO CIC Decimation Filter FIR Filters D MIXER: 32-BIT FREQUENCY AND PHASE D DECIMATION RATIO 4096 D USER PROGRAMMABLE FIR FILTERS ...

Page 2

... MIN TYP −40 3.15 3.3 1.6 1.8 1.6 VCM 2 5 0.4 1.65 2 5.625 6.25 5.625 6.25 0.7 × IOVDD www.ti.com ORDERING TRANSPORT MEDIA, NUMBER QUANTITY AFE8201PFBT Tape and Reel, 250 AFE8201PFBR Tape and Reel, 2000 MAX UNITS °C 85 3.45 V 2 MHz 3 0 0.25 × IOVDD V ...

Page 3

AUXILIARY DAC CHARACTERISTICS All specifications at +25°C, AVDD = +3.3V, and DVDD = +1.8V, unless otherwise noted. PARAMETER Resolution Output voltage range Output voltage range Output impedance Settling time Offset Gain error DC DC Differential nonlinearity, DNL performance performance ...

Page 4

AFE8201 SBWS016A − OCTOBER 2003 − REVISED JANUARY 2005 DIGITAL INTERFACE SPECIFICATIONS All specifications at +25°C, AVDD = 3.3V, DVDD = 1.8V, and V DDS = 3.3V, unless otherwise noted. PARAMETER High Level Input Current Low-Level Input Current, ...

Page 5

CONTROL INTERFACE TIMING SCK CS_N MOSI MISO su3 PARAMETER Maximum SCK Frequency CS_N Leading Time Trailing CS_N to Leading SCK CS_N Trailing Time Trailing SCK to Leading CS_N CS_N Idle Time, t ...

Page 6

AFE8201 SBWS016A − OCTOBER 2003 − REVISED JANUARY 2005 PIN ASSIGNMENTS AVDD 1 AGND 2 IFP 3 4 IFM AGND 5 VCM 6 AVDD 7 VREFM 8 VREFP 9 AVDD 10 11 AGND VBG 12 NAME PIN IFP 3 IFM ...

Page 7

DETAILED DESCRIPTION The AFE8201 consists of a general-purpose, 80MSPS, 12-bit analog-to-digital converter (ADC) with programmable input range, Digital Downconverter (DDC), and user programmable digital filters with 16-bit coefficients designed to sample narrowband (up to 2.5MHz) IF signals ...

Page 8

AFE8201 SBWS016A − OCTOBER 2003 − REVISED JANUARY 2005 Memory Bank Address 0 FIR Filter 1 Coefficients 1 FIR Filter 2A Coefficients 2 FIR Filter 2B Coefficients The SPI interface consists of four signals: a serial clock (SCK), an active-low ...

Page 9

The read cycle is illustrated in Figure similar to the write cycle, except that instead of the data word being clocked into MOSI during the second half of the cycle, the data word is clocked out ...

Page 10

AFE8201 SBWS016A − OCTOBER 2003 − REVISED JANUARY 2005 DATA INTERFACE The data interface consists of six signals: 1. serial data clock DCLKO; 2. output frame sync DFSO; 3. output data line DOUT0; 4. output data line DOUT1; 5. input ...

Page 11

DCLKO DFSO MSB DOUT0 IA MSB DOUT1 IB DFSI DIN Figure 13. Data Interface Timing for MODE = 1 When the data interface receives new outputs from the decimation filters, an output cycle is started by asserting DFSO for ...

Page 12

AFE8201 SBWS016A − OCTOBER 2003 − REVISED JANUARY 2005 MSB Register Address Register Address Register Address ...

Page 13

FIRST FIR FILTER The block following the CIC filter is a decimate-by-two FIR filter with programmable coefficients. MODE sets the type of filter response—ODD (MODE = 00: symmetric impulse response, odd number of taps), EVEN (MODE = 01: symmetric ...

Page 14

AFE8201 SBWS016A − OCTOBER 2003 − REVISED JANUARY 2005 COMPUTATION COEFFICIENT CYCLE BANK EVEN Figure 17. Application of Filter Coefficients in Different Filter Modes 14 FILTER PROCESSING ODD HALFBAND www.ti.com ARBITRARY ...

Page 15

For example, using the ODD mode in the first cycle of MCLK, the filter coefficient at BASE_ADDR is applied to two values in data memory, the most recent at address N and the oldest at address N+10. In the ...

Page 16

AFE8201 SBWS016A − OCTOBER 2003 − REVISED JANUARY 2005 SECOND FIR FILTER The second FIR filter, shown in Figure 18, is similar to the first FIR filter with three notable exceptions. First, the depth of the coefficient and data memories ...

Page 17

AUXILIARY DAC In normal operation the auxiliary DAC values are sent over the data interface through input pin DIN and framed by DFSI. The auxiliary DAC control register, shown in Figure 19, allows the DAC value to be set ...

Page 18

... PACKAGING INFORMATION (1) Orderable Device Status AFE8201PFBR PREVIEW AFE8201PFBT PREVIEW (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design ...

Page 19

PFB (S-PQFP-G48) 0, 5,50 TYP 7,20 SQ 6,80 9,20 SQ 8,80 1,05 0,95 1,20 MAX NOTES: A. All linear dimensions are in millimeters. B. This drawing is subject to change without notice. C. Falls within JEDEC ...

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Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the ...

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