AD7011 판매점 - CMOS/ ADC p/4 DQPSK Baseband Transmit Port

AD7011 반도체 회로 부품 판매점

CMOS/ ADC p/4 DQPSK Baseband Transmit Port

Analog Devices

FEATURES

Single +5 V Supply

On-Chip ␲/4 DQPSK Modulator

Modulator Bypass Analog Mode

Root-Raised Cosine Tx Filters, ␣ = 0.35

Two 10-Bit D/A Converters

4th Order Reconstruction Filters

Differential Analog Outputs

On-Chip Ramp Up/Down Power Control

On-Chip Tx Offset Calibration

Dual Mode Operation, Analog and Digital

Very Low Power Dissipation, 30 mW typical

Power Down Mode < 10 ␮A

On-Chip Voltage Reference

24-Pin SSOP

APPLICATIONS

American Digital Cellular Telephony

American Analog Cellular Telephony

CMOS, ADC ␲/4 DQPSK

Baseband Transmit Port

AD7011

GENERAL DESCRIPTION

The AD7011 is a complete low power, CMOS, π/4 DQPSK

modulator with single +5 V power supply. The part is designed

to perform the baseband conversion of I and Q transmit wave-

forms in accordance with the American Digital Cellular Tele-

phone system (TIA IS-54).

The on-chip π/4 Differential Quadrature Phase Shift Keying

(DQPSK) digital modulator, which includes the root raised

cosine filters, generates I and Q data in response to the transmit

data stream. The AD7011 also contains ramp control envelope

logic to shape the I and Q output waveforms when ramping up

or down at the beginning or end of a transmit burst.

Besides providing all the necessary logic to perform π/4 DQPSK

modulation, the part also provides reconstruction filters to

smooth the DAC outputs, providing continuous time analog

outputs. The AD7011 generates differential analog outputs for

both the I and Q signals.

As it is a necessity for all digital mobile systems to use the lowest

possible power, the device has transmit and receive power-down

options. The AD7011 is housed in a space efficient 24-pin

SSOP (Shrink Small Outline Package).

MCLK

BIN (Q DATA)

Tx DATA (I DATA)

Tx CLK (FRAME)

READY

POWER

FUNCTIONAL BLOCK DIAGRAM

DGND

VDD

VAA

AGND

ANALOG MODE

SERIAL

INTERFACE Q

π /4 DQPSK

DIGITAL

MODULATOR

BYPASS

10-BIT

I-DAC

10-BIT

Q-DAC

RECONSTRUCTION

FILTERS

ITx

CALIBRATION CIRCUITRY

RECONSTRUCTION

FILTERS

QTx

AD7011

2.46V

REFERENCE

BOUT

BYPASS MODE1 MODE2

REV. B

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

which may result from its use. No license is granted by implication or

otherwise under any patent or patent rights of Analog Devices.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 617/329-4700

Fax: 617/326-8703

AD7011–SPECIFICATIONS1

(VAA = VDD = +5 V ؎ 10%; Test = AGND = DGND = 0 V; Digital Mode,

fMCLK = 3.1104 MHz; Analog Mode, fMCLK = 2.56 MHz, POWER = VDD. All specifications are TMIN to TMAX unless otherwise noted.)

Parameter

AD7011ARS

Units

Test Conditions/Comments

DIGITAL MODE TRANSMIT SPECIFICATIONS

Number of Channels

Output Signal Range

Differential Output Range

Signal Vector Magnitude2

Error Vector Magnitude2

Offset Vector Magnitude2

IS-54 Spurious Power2, 3

@ 30 kHz

@ 60 kHz

@ 90 kHz, 120 kHz

VREF + VREF/4

+VREF/2

0.875 ± 7.5%

2.5

0.5

2.5

–35

–30

–70

–65

–75

–70

Volts

Volts max

% rms typ

% rms max

% typ

% max

dB typ

dB max

dB typ

dB max

dB typ

dB max

(ITx – ITx) and (QTx – QTx)

For Each Analog Output

I Channel = (ITx – ITx) and

Q Channel = (QTx – QTx)

Measured Differentially

ANALOG MODE SPECIFICATIONS

No. of Channels

Resolution

Output Signal Range

Differential Output Range

DAC Update Rate

SNR

Differential Offset Error

Group Delay Matching Between I & Q Outputs

Coding

Maximum and Minimum DAC Codes4

VREF ± VREF/3

± 2VREF/3

Bits

Volts

160

± 15

Twos Complement

+450/–450

kHz

dB typ

dB min

mV max

ns typ

max/min

(ITx – ITx) and (QTx – QTx)

For Each Analog Output

I Channel = (ITx – ITx) and

Q Channel = (QTx – QTx)

MCLK/16; fMCLK = 2.56 MHz

Generating a 10 kHz Sine Wave

Post Calibration

REFERENCE & CHANNEL SPECIFICATIONS

Reference, VREF

Reference Accuracy

I and Q Gain Matching

Power-Down Option

2.46

±5

± 0.2

Yes

Volts

dB max

Measured @ 10 kHz

Power = 0 V

LOGIC INPUTS

VINH, Input High Voltage

VINL, Input Low Voltage

IINH, Input Current

CIN, Input Capacitance

VDD – 0.9

0.9

V min

V max

FA max

pF max

LOGIC OUTPUTS

VOH Output High Voltage

VOL Output Low Voltage

VDD – 0.4

0.4

V min

V max

|IOUT| ≤ 40 µA

|IOUT| ≤ 1.6 mA

POWER SUPPLIES

VDD

IDD

Transmit Section Active

Transmit Section Powered Down5

4.5/5.5

V min/V max

mA max

mA typ

µA max

POWER = VDD

MCLK Active

MCLK Inactive

NOTES

1Operating temperature ranges as follows: A Version: –40°C to +85°C.

2See terminology.

3Measured in continuous transmission and Burst Mode with the I and Q channels ramping up and down at the beginning and end of a burst.

4Headroom must be allowed for the transmit DACs such that offsets in I & Q transmit channels can be calibrated out. Therefore, the full range of the I and Q DACs

are not available to the user. The user should ensure that binary codes greater than or less than the maximum or minimum are not loaded into the I or Q DACs.

5Measured while the digital inputs to the transmit interface are static and equal to 0 V or V DD.

Specifications subject to change without notice.

–2– REV. B

PDF 파일 내의 페이지 : 총 12 페이지

제조업체: Analog Devices

( analogs )

AD7011 cmos

데이터시트 다운로드 :

[ AD7011.PDF ]

[ AD7011 다른 제조사 검색 ]

국내 전력반도체 판매점

상호 : 아이지 인터내셔날

전화번호 : 051-319-2877

[ 홈페이지 ]

IGBT, TR 모듈, SCR, 다이오드모듈, 각종 전력 휴즈

( IYXS, Powerex, Toshiba, Fuji, Bussmann, Eaton )

전력반도체 문의 : 010-3582-2743

일반적인 전자부품 판매점

디바이스마트

IC114

엘레파츠

ICbanQ

Mouser Electronics

DigiKey Electronics

Element14

AD7011 반도체 회로 부품 판매점

CMOS/ ADC p/4 DQPSK Baseband Transmit Port

국내 전력반도체 판매점

일반적인 전자부품 판매점

관련 데이터시트