Datasheet RF9958, RF9958PCBA Datasheet (RF Micro Devices)

RF9958

5

Typical Applications

• CDMA/FM Cellular Systems

• CDMA PCS Systems

• Wireless Local Loop Systems

Product Description

The RF9958 isan integrated complete Quadrature Modu­lator, IF AGC amplifier, and Upconverter designed for the
transmit section of dual-mode CDMA/FM cellular and
PCS applications. It is designed to modulate baseband I
and Q signals, amplify the resulting IF signals while pro­viding 95 dB of gain control range, and perform the final
upconversion to UHF. NoiseFigure, IP

cations are designed to be compatible with the IS-98
Interim Standard for CDMA cellular communications. This
circuit is designed as part of RFMD’s newest CDMA Chip
Set, which also includes the RF9957 CDMA/FM Receive
IF AGC and Demodulator. The IC is manufactured on an
advanced 15GHz F

Silicon Bipolar process, and is sup-

T

plied in a 28-lead plastic SSOP package.

, and other specifi-

3

CDMA/FM TRANSMIT MODULATOR, IF AGC,

AND UPCONVERTER

• Spread Spectrum Cordless Phones

• High Speed Data Modems

• General Purpose Digital Transmitters

6.20

5.79

3.99

PIN 1

INDENT

0.25

0.10

3.81

10.01

7°

8°

1.27

0°

0.38

NOTES:

1. Shaded lead is Pin1.

2. Lead frame material: Copper 194

3. Mold flash shall not exceed 0.006 (0.15 mm) per end.

4. Interlead flash shall not exceed 0.010 (0.25 mm) per side.

5. All dimensions are excluding mold flash and protrusions.

9.80

0.25

0.10

1.73

1.47

0.36

0.23

0.635
TYP

TYP

5

UPCONVERTERS

MODULATORS AND

Optimum Technology Matching® Applied

Si BJT GaAs MESFETGaAs HBT

ü

Si Bi-CMOS

Q SIG

2

Q REF

3

LO1-

8

LO1+

9

I REF

5

I SIG

4

Quad.

÷

SiGe HBT

MODE

1

Σ

2

Band Gap
Reference

10

13

PD1

GOUT

27

Gain

Control

15

GC

PD2

Si CMOS

17

LO2+

RF OUT

25
24
21
22

2019

LO2-

Functional Block Diagram

MOD OUT+
MOD OUT­MIX IN­MIX IN+

Package Style: QSOP-28

Features

• Supports Dual Mode Operation

• Digitally Controlled Power Down Modes

• 2.7V to 3.3V Operation

• Digital First LO Quadrature Divider

• Double-Balanced UHF Upconvert Mixer

•IFAGCAmpwith95dBGainControl

Ordering Information

RF9958 CDMA/FM Transmit Modulator, IF AGC,and Upcon-

RF9958 PCBA Fully Assembled Evaluation Board

RF Micro Devices, Inc.
7628 Thorndike Road
Greensboro,NC 27409, USA

verter

Tel [phone]

Fax [phone]

http://www.rfmd.com

Rev B11 010720

5-93

RF9958

Absolute Maximum Ratings

Parameter Rating Unit

Supply Voltage -0.5 to +5 V
Power Down Voltage (VPD) -0.5toVCC+0.7 V
I and Q Levels, per pin 1 V
LO1 Level, balanced +3 dBm

LO2 Level, balanced +6 dBm
Operating Ambient Temperature -40 to +85 °C
Storage Temperature -40 to +150 °C

DC

PP

Caution! ESD sensitive device.

RF Micro Devices believesthe furnishedinformation is correctand accurate
at the time of this printing. However, RF Micro Devices reserves the right to
make changes to its products without notice.RF Micro Devices does not
assume responsibility for the use of the described product(s).

5

Parameter

Min. Typ. Max.

I/Q Modulator & AG C

I/Q Input Frequency Range 0 to 20 MHz Balanced
I/Q Input Impedance 50 80 110 kΩ Balanced
I/Q Input Reference Level 0.6 V

LO1/FM Frequency R ange 100 to 360 MHz
LO1/FM Input Level -15 -8 -5 dBm

UPCONVERTERS

MODULATORS AND

LO1/FM Input Impedance 170 200 230 Ω Balanced
Sideband Suppression 35 40 dBc I/Q Amplitude adjusted to within ±20mV

Carrier Suppression 40 50 dBc I/Q DC Offset adjusted to within ±20mV

Max Output, FM Mode +2.5 +4 dBm V
Max Output, CDMA Mode -3 0 dBm V

Min Output, CDMA Mode -95 -89 dBm V

Output Power Accuracy -3 +3 dB T=-20 to +85°C, Ref=25 °C

Adjacent Channel Power Rejec-

tion @ 885kHz

Adjacent Channel Power Rejec-

tion @ 1.98MHz

Output No ise Power -116 -111 dBm/Hz P

Output Impedance 170 200 230 Ω Balanced
Power Dissipation 150 mW T=-20°C to +85°C

UHF Upconverter

Conversion Gain -1 0.5 dB
Noise Figure (SSB) 15 dB
Output IP3 +14 dBm
IF Input Impedance 170 200 230 Ω Balanced
IF Input Frequency Range 50 to 180 MHz
LO2 Input Impedance 50 Ω Single Ende d
LO2 Input Level -6 -3 0 dBm
LO2 Input Frequency Range 700 to 1100 MHz
RF to LO2 Isolation 20 dB

Specification

30 dBc Unadjusted

30 dBc Unadjusted

-2 0 dB m ISIG=QSIQ=300mVpp@ 100kHz

-2 +2 dB 1.4V≤GC≤ 2.5

-55 dBc IS-95A CDMA Modulation

-67 dBc IS-95A CDMA Modulation

-137 -132 dBm/Hz P

-164 -159 dBm/Hz P

Unit Condition

DC

T=25°C, VCC=3.0V, Z
LO1=-8dBm@260M Hz,

LO2=-3dBm@960MHz,
I SIG=Q SIG=300mV

RF Output externally matched

Per Pin

=2.5 VDC,T=-20°Cto+85°C

GC

=2.5 VDC,T=-20°Cto+85°C,

GC

IS-95A CDMA Modulation

=0.5 VDC,T=-20°Cto+85°C,

GC

IS-95A CDMA Modulation

P

=-5dBm

OUT

=-5dBm

P

OUT

=-3dBm,T=-20°Cto+85°C

OUT

= -23 dBm,T=-20°C to +85°C

OUT

< -70 dBm,T=-20°C to +85°C

OUT

Output externally matched

LOAD

,

PP

=50Ω,

5-94

Rev B11 010720

RF9958

Parameter

Power Supply

Supply Voltage 2.7 3.0 3.3 V
Current Consu mption 43 mA Modulator and AGC only, CDMA Mode
Current Consumption 20 mA Mixer Only
Power Down Current 20 µA
VPD HIGH Voltage V

VPD LOW Voltage 0.5 V

Min. Typ. Max.

Specification

-0.7 V

CC

Unit Condition

5

UPCONVERTERS

MODULATORS AND

Rev B11 010720

5-95

RF9958

Pin Function Description Interface Schematic

1MODE

Selects between CDMA and FM mode. This is a digitally controlled
input. A logic “high” (≥V

(<0.5V

) selects FM mode. In FM mode, this switch enables the FM

DC

-0.7VDC) selects CDMA mode. A logic “low”

CC

amplifier and turns off the I&Q modulator. The impedance on this pin is
30kΩ. A DC voltage less than or equal to the maximum allowable Vcc
may be applied to this pin when no voltage is applied to the Vcc pins.

MODE

60 k

BIAS

Ω

60 k

Ω

5

2QSIG

Baseband input to theQ mixer. This pinis DC coupled. The DC level of

0.6V must be supplied to this pin to bias the transistor. Input imped­ance of this pin is 50kΩ minimum. A DC voltage less than or equal to
the maximum allowable Vcc may be applied to this pin when no voltage

BIAS BIAS

8k

Ω

8k

Ω

is applied to the Vcc pins.

Q SIG Q REF

3QREF

Reference voltage for the Q mixer. This voltage should be the same as
the DC voltage supplied to the Q SIG pin.For maximum carrier sup-

See pin 2.

pression, DC voltage on this pin relative to the Q SIG DC voltage may
be adjusted. Input impedance of this pin is 50kΩ minimum. A DC volt­age less than or equal to the maximum allowable Vcc may be applied to
this pin when no voltage is applied to the Vcc pins.

4IREF

UPCONVERTERS

MODULATORS AND

Reference voltage for the I mixer. This voltage should be the same as
the DC voltage supplied tothe I SIG pin. Formaximum carrier suppres­sion, DC voltage on this pin relative to the I SIG DC voltage may be

See pin 5.

adjusted. Input impedance of this pin is 50kΩ minimum. A DC voltage
less than or equal to the maximum allowable Vcc may be applied to this
pin when no voltage is applied to the Vcc pins.

5ISIG

Baseband input to the Imixer. This pin is DC coupled. The DC level of

0.6V must be supplied to this pin to bias the transistor. Input imped­ance of this pin is 50kΩ minimum. A DC voltage less than or equal to
the maximum allowable Vcc may be applied to this pin when no voltage

BIAS BIAS

8k

Ω

8k

Ω

is applied to the Vcc pins.

I SIG I REF

6 GND1

7 VCC1

8LO1+,FM+

9LO1-,FM-

5-96

Ground connection for all baseband circuits in cluding bandgap, AGC,
flip-flop, modulator and FM amp. Keep traces physically short and con­nect immediately to ground plane for best performance.

Supply Voltageforthe LO1 flip-flopand limiting amponly.Thissupplyis
isolated to minimize the carrier leakage.A 1nF external bypass capaci­tor is required, and an additional 0.1µF will be required if no other low
frequency bypass capacitors are nearby. The trace length between the
pin and the bypass capacito rs shouldbe minimized.The groundside of
the bypass capacitors should connect immediately to ground plane.

One half of the balanced modulator LO1 input. The other half of the
input, LO1-, is AC grounded for single-ended input applications. The
frequency on these pins is divided by a factor of 2, hence the carrier
frequency for the modulator becomes one hal f of the appliedfrequency.
The single-ended input impedance is 100Ω (balanced is 200Ω). This
pin is NOT internally DC blocked. An external blocking capacitor (1nF
recommended) mustbe provided if the pin is connected to a device
with DC present. When FM mode is selecte d, the output of the flip-flop
divider circuit is switched to the AGC amplifier inputsand the modulator
mixers are not used. Note that the frequency deviation input here w ill
be reduced by a factor of two,due to the frequency divider operation.

One half ofthe balanced modulato r LO1 input. In single-ended applica­tions (100Ω inpu t impedance), this pin is AC grounded with a 1nF
capacitor.

V

CC1

100

Ω

LO1+, FM+ LO1-, FM-

V

CC1

100

Ω

See pin 8.

Rev B11 010720

RF9958

Pin Function Description Interface Schematic

10 BG OUT

11 VCC3

12 GND1
13 PD1

14 VCC4

15 PD2

Bandgap voltage reference. This voltage, constant overtemperature
and supply variation, is used to bias internal circuits. A 1nF external
bypass capacitor is required.

Supply voltage for the AGC and the Bandgap circuitry. A 1nF external
bypass capacitor is required and an additional 0.1µF will be required if
no other low frequency bypass capacitors are nearby. The trace length
between the pin and the bypass capacitors should be minimized. The
ground side of the bypass capacitors should connect immediately to
ground plane.

Same as pin 6.
Power down control for overall circuit. When logic “high” (≥VCC-0.7V),

all circuits are operating; when logic “low” (≤0.5V), all circuits are
turned off. The inputimpedance of this pin is >10kΩ.ADCvoltageless
than or equal to the maximum allowable Vcc may be applied to this pin
when no voltage is applied to the Vcc pins.

Supply for the mixer stage only. The supply for the mixer is separated to
maximize IF to RF isolations and reduce the carrier leakage. A 100pF
external bypass capacitor is required and an additional 0.1µF will be
required if no other low frequency bypass capacitors are nearby. The
trace length between the pin and the bypass capacitors should be min­imized. The ground side of the bypass capacitors should connect
immediately togro und plane.

Power down control for mixer only. When connected to pin 10 (BG
OUT) the mixer circuits are operating; when connected to ground
(≤0.5V), the mixer is turned off but all othercircuitsare operating. A DC
voltage less than or equal to the maximum allowable Vcc maybe
applied to this pin when no voltage is applied to the Vcc pins.

PD1

PD2

10 k

1k

Ω

Ω

450

5

UPCONVERTERS

MODULATORS AND

Ω

16 GND2
17 RF OUT

18 DEC

19 LO2+

20 LO2­21 MIX IN-

Ground connection for the mixer stage. Keep traces physically short
and connect immediately to ground plane for best performance.

RF output pin. An external shunt inductor to VCCplus a series blocking/
matching capacitor are required for 50 Ω output.

Current Mirror decoupling pin. A 1000pF external capacitor is required
to bypass this pin. The ground side of the bypass capacitors should
connect immediately to ground plane.

One half of the balancedmixer LO2 input.In single-ended applications,
the other half of the input, LO2- is AC grounded. This is a 50Ω imped­ance port. This pin is NOT internally DC blocked. An external blocking
capacitor (100pF recommended) must be provided if the pi n is con­nected to a device with D C present.

One half of the balance mixer LO2 input. In single ended applications,
this pin is AC grounded with a 100pF capacitor.

One half of the 200Ω balanced impedance input to the mixer stage.
This pin is NOT internally DC blocked. An external blocking capacitor
(2200pF recommended) must be provided if the pin is connected to a
device with DC present. If no IF filter is needed this pin may be con­nected to MOD OUT+ through a DC blo cking capacitor. An appropriate
matching network may be n eeded if an IF filter is used.

V

CC4

300

Ω

RF OUT

BIAS

40

Ω

LO2+ LO2-

BIAS

40

See pin 19.

BIAS

100

Ω

MIX IN- MIX IN+

BIAS

100

Ω

Ω

Rev B11 010720

5-97

RF9958

Pin Function Description Interface Schematic

22 MIX IN+
23 GND2
24 MOD OUT-

Same as pin 21, except complementary input. See pin 21.
Same as pin 16.
One half of the balanced AGC output port. The impedance of this port

is 200Ω balanced. If no filtering is required, this pin can be connec ted

V

CC3

to the MIX IN- pin througha DC blocking capacitor.This pin requires an
inductor to V

to achieve full dynamic range. In order to maximize

CC

100

gain, this inductor should be a high-Q type and should be parallel reso­nated out with a capacitor (see application schematic). This pin is NOT
DC blocked. A blocking capacitor of 2200pF is needed when this pin is
connected to a DC path. An appropriate matching network may be
needed if an IF filter is used.

V

CC3

Ω

100

Ω

MOD OUT­MOD OUT+

5

25 MOD OUT+
26 DEC

Same as pin 24, except complementary output. See pin 24.
AGC decoupling pin. Anexternal bypasscapacitor of 10nF capacitor is

required. The trace length between the pin and the bypass capacitors
should be minimized. The ground side of the bypass capacitors should
connect im mediately to ground plane.

27 GC

Analog gain control for AGC amplifiers. Valid control voltage ranges are
from 0.5V

to 2.5VDC. The gain range for the AGC is 88dB. These

DC

voltages are valid ONLY for a 37kΩ source impedance. A DC voltage
less than or equal to the maximum allowable Vcc may be applied to this

BIAS

21 k

Ω

pin when no voltage is applied to the Vcc pins.

UPCONVERTERS

MODULATORS AND

28 VCC2

Supply for the modulator stage only. A 10nF external bypass capacitor
is required and an additional 0.1µF will be required ifno other low fre-

GC

40 k

Ω

quency bypass capacitors are nearby.The trace length betweenthe pin
and the bypass capacitors should be minimized.The ground sideof the
bypass capacitors should connect immediately to ground plane.

5-98

Rev B11 010720

RF9958 Pin-Out

RF9958

MODE

Q SIG

Q REF

I REF

I SIG

GND1

VCC1

LO1+

LO1-

BG OUT

VCC3

GND1

PD1

VCC4

1

2

3

4

5

6

7

8

9

10

11

12

13

14

28

VCC2

27

GC

26

DEC

25

MOD OUT+

24

MOD OUT-

23

GND2

22

MIX IN+

21

MIX IN-

20

LO2-

19

LO2+

18

DEC

17

RF OUT

16

GND2

15

PD2

5

UPCONVERTERS

MODULATORS AND

Rev B11 010720

5-99

5

RF9958

Mode Select

Q Signal

Reference

I Signal

LO1/FM In

10 nF

Application Schematic

1

10 nF

V

CC

2

3

4

5

6

7

8

MODE

Q SIG

Q REF

I REF

I SIG

GND1

VCC1

LO1+

VCC2

MOD OUT+

MOD OUT-

GND2

MIX IN+

MIX IN-

GC

DEC

V

Ω

18 pF

82 nH
82 nH

18 pF

IF Filter,

DC Blocked

CC

Gain Control

V

CC

10 nF

10 nF

28

37 k

27

1nF

26

10 nF

25

24

23

22

21

9

LO1-

1nF

10

11

12

13

14

BG OUT

VCC3

GND1

PD1

VCC4

RF OUT

UPCONVERTERS

MODULATORS AND

1nF

Power Down 1

100 pF

10 nF

1nF

LO2-

LO2+

DEC

GND2

PD2

20

100 pF

19

100 pF

18

1000 pF

17

16

15

1nF

LO2 In

V

CC

L1

RF Out

C1

Power Down 2

5-100

Rev B11 010720

MODE
Q SIG

J3

IREF

I SIG

J2

LO IN

J1

PD1

VCC

RF9958

Evaluation Board Schemati c

(Download Bill of Materials from www.rfmd.com.)

P1

C20

µ

C3 1 nF

C4 100 nF

F

1
2
3

C2

10 nF

C1

1nF

C5

1nF

MODE
GND
GC

1nF

10

11

12

13

14

C6

1

2

3

4

5

6

7

8

9

P2-1

P2-3

MODE

Q SIG

Q REF

I REF

I SIG

GND1

VCC1

LO1+

LO1-

BG OUT

VCC3

GND1

PD1

VCC4

P1-1

P1-3

C19
1

µ

F

50

Ω µ

strip

1

P2

1
2
3

9958400B

R3 0

Ω

VCC
GND
IREF

VCC2

GC

DEC

MOD OUT+

MOD OUT-

GND2

MIX IN+

MIX IN-

LO2-

LO2+

DEC

RF OUT

GND2

PD2

P3-2

28

27

26

25

24

23

22

21

20

19

18

17

16

15

P3

1
2
3
4
5

C8 10 nF

C15

10 nF

C16 2.2 nF

C17 2.2 nF

C12 100 pF

C18 100 pF

C11 1000 pF

GND
PD1

PD1P3-4

C9

10 nF

C10
1nF

T1

1

T2

1

C13 33 pF

L2

12 nH

C7

1nF

VCC

Ω

R1

Ω

27 k

MOD OUT

J4

VCC

MIX IN

J5

LO2 IN

J6

50

Ω µ

strip

VCC

MODE

RF OUT

5

UPCONVERTERS

MODULATORS AND

J7

R2

10 k

50

Ω µ

strip

50

Ω µ

strip

50

Ω µ

strip

L1

15 nH

C14

1.3 pF

Rev B11 010720

5-101

5

RF9958

Evaluation Board Layout

2.689" X 2.521"

UPCONVERTERS

MODULATORS AND

5-102

Rev B11 010720

RF9958

5

UPCONVERTERS

MODULATORS AND

Rev B11 010720

5-103

RF9958

5

MODOU TOutput Power versus Gain Control Voltage

10.0

0.0

-10.0

-20.0

-30.0

-40.0

-50.0

-60.0

-70.0

MODOUT Output Power (dBm)

-80.0

-90.0

-100.0

0.5 1.0 1.5 2.0 2.5

(VCC=3.0V, 130 MHz)

GC (V)

+25°C

-30°C
+85°C

-100.0

-110.0

-120.0

-130.0

-140.0

Noise Power (dBm/Hz)

-150.0

-160.0

-170.0

0.5 1.0 1.5 2.0 2.5

MODOUT Noise Power versus Gain Control

(VCC=3.0 V, 85 MHz)

GC(V)

-40C
+25 C
+85 C

MODOUT IM3 Suppression versus Output Level

43.0

UPCONVERTERS

MODULATORS AND

42.0

41.0

(VCC=3.0V, 130 MHz)

40.0

39.0

38.0

MODOUT Output IM3 Suppression (dBc)

37.0

-18.0 -16.0 -14.0 -12.0 -10.0 -8.0 -6.0 -4.0 -2.0

MODOUTOutputLevel (dBm)

5-104

Rev B11 010720