Intersil Corporation HFA3763 Datasheet

HFA3763

Data Sheet June 1999

400MHz Quadrature Modulator and AGC

™

The HFA3763 is a highly integrated
baseband converter for quadrature
modulation applications. The HFA3763
400MHz quadrature modulator and

AGC is one of the seven chips in the
PRISM® full duplex chip set (see Typical Application
Diagram). It features all the necessary blocks for baseband
modulation of I and Q signals. An output AGCandBaseband
shaping filters are integrated in the design. Four filter
bandwidths are programmable via a two bit digital control
interface. In addition, these filters are continuously tunable
over a ±20% frequency range via one external resistor. The
modulator channel receives digital or analog I and Q data for
processing. To achieve broadband operation, the Local
Oscillator frequency input is required to be twice the desired
frequency of modulation. A selectable buffered divide by 2
LO output and a stable reference voltage are provided for
convenience of the user.

Ordering Information

TEMP.

PART NUMBER

HFA3763IN -40 to 85 80 Ld TQFP Q80.14x14

RANGE (oC) PACKAGE PKG. NO.

File Number

4237.4

Features

• Integrates all IF Transmit Functions

• Broad Frequency Range . . . . . . . . . . .10MHz to 400MHz

• I/Q Amplitude and Phase Balance . . . . . . . . . . . 0.2dB, 2

• 5th Order Programmable

Low Pass Filter. . . . . . . . . . . . . . . . . . .2.2MHz - 17.6MHz

• 400MHz Output AGC Amplifier/Attenuator . . . . . . . .45dB

• Selectable Digital or Analog TX Baseband Inputs

• Low LO Drive Level . . . . . . . . . . . . . . . . . . . . . . . -15dBm

• Fast Transmit-on Switching . . . . . . . . . . . . . . . . . . . . .1µs

• Power Management/Standby Mode

• Single Supply 2.7V to 5.5V Operation

Applications

• Wireless Local Loop Systems

• Wireless Local Area Networks

• PCMCIA Wireless Duplex Transceivers

• ISM Systems

• TDMA Packet Protocol Radios

• PCS/Wireless PBX

o

Simplified Block Diagram

MOD_LO_OUT

LO_GND

IF_OUT

4-1

MOD_LO_IN

o

0o/90

÷2

∑

IF_AGC_IN

AGC_CTRL

MOD_TX_IF_OUT

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

PRISM® is a registered trademark of Intersil Corporation. PRISM logo is a trademark of Intersil Corporation.

MOD_TX_Q

http://www.intersil.com or 407-727-9207

LPF_TUNE_1

LPF_TX_I

MOD_TX_I

LPF_TX_Q

LPF_SEL0

LPF_SEL1

LPF_TUNE_0

I

Q

2V

REF

2V REF

LPF_TXI_IN

LPF_TXQ_IN

TX D OR A

| Copyright © Intersil Corporation 1999

Pinout

HFA3763

80 LEAD TQFP

TOP VIEW

GND
GND
GND
GND
GND
GND
GND
GND

LPF_V

CC

2V REF

LPF_BYP

LPF_TXI_IN

LPF_TXQ_IN

NC

NC
LPF_SEL1
LPF_SEL0

LPF_TUNE1
LPF_TUNE0

TX D or A

GND

GND

GND

GND

80

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20

21222324252627282930313233343536

GND

LPF_TXQ-

LPF_TXQ+

LPF_TX_PE

GND

GND

GND

NC

LPF_TXI-

LPF_TXI+

GND

NC

GND

NC

GND

NC

GND

GND

GND

GND

CC

GND

GND

AGC_V

NCNCNC

AGC_PE

GND

IF_OUT

64656667686970717273747576777879

636261

37383940

NC

MOD_TXI-

MOD_TXI+

CC

AGC_V

GND

60
59
58
57
56
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41

MOD_TXQ-

MOD_TXQ+

GND
AGC_CTRL

GND
AGC_V

CC

GND

IF_AGC_IN
GND
GND
GND
GND
LO_GND
MOD_BYP
MOD_BYP
MOD_V

CC

MOD_LO_OUT
MOD_V

CC

MOD_LO_IN
GND
MOD_TX_IF_OUT

MOD_TX_PE

Typical Application Diagram

PRISM FULL DUPLEX CHIP SET

HFA3661

(File #4240)

LNA

CONVERTER

SYNTHESIZER

SYNTHESIZER

AGC

CONVERTER

HFA3663 (File #4241)
HFA3664 (File #4242)

4-2

D
U
P
L
E
X
E
R

HFA3424/21
(File #4131)

LNA BPF

HFA3925

(File #4132)

PA BPF

HFA3524

(File #4062)

HFA3524

(File #4062)

RF/IF

RF LO1

RF LO2

IF/RF

FILTER

IF LO1

IF LO2

HFA3761 (File #4236)

IF AGC

AGC

QMODEM

QMODEM

LPF

A/D

LPF

BASEBAND

HFA3763

(File #4237)

LPF

D/A

LPF

OPTIONAL WHEN IN
ANALOG MODE

PRISM FULL DUPLEX RADIO
CHIP SET, FILE #4238

Block Diagram

HFA3763

LPF_SEL1
LPF_SEL0

LPF_TUNE0

LPF_TUNE1

1.25V

2V

REF

o

o

/90
0

÷2

LPF_TXI_IN

I

LPF_TXQ_IN

Q

∑

TX D or A

LPF_TX_PE

LPF_TX_Q ­LPF_TX_Q +

LPF_TX_I ­LPF_TX_I +

MOD TX I +
MOD TX I -

MOD TX Q +
MOD TX Q -

MOD_TX_PE

V

CC

(2XLO)

MOD_LO_IN

NOTE: VCC, GND and Bypass capacitors not shown.

4-3

LO_GND

50Ω

MOD_LO_OUT

MOD_TX_IF_OUT

IF_AGC_IN

V

CC

L

1

C

1

OUTPUT MATCH COMPONENTS TABLE

FREQ. L

C

L

2

IF_OUT

2

50Ω

NETWORK

105MHz 270nH 12pF 82nH 15pF
280MHz 82nH 5.0pF 33nH 6.0pF

10K

250

AGC_CTRL

1

C

L

1

C

2

2