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TELEFUNKEN Semiconductors
U2891B
2.5 GHz Quadrature Up-Converter
Description
The U2891B is a silicon monolithic IC made with TELE-
FUNKEN’s advanced UHF process. The IC consists of a
500 MHz I/Q quadrature modulator and a 2.5 GHz mixer.
Both parts can be connected via an external filter in order
to suppress harmonics and spurious products. The device
features 3 V operation, a low current consumption and
furthermore two separate power-down functions for mod-
ulator and mixer. The RF ports are single ended and the
device can be operated adjustment free, but for optimiza-
tion also two pins for phase adjustment are provided.
These features and the double conversion concept of
U2891B make this device perfectly suited for all digital
radio applications from 900 MHz up to 2.5 GHz (e.g.,
GSM, DCS 1800, JDC, PHP and WLAN).
Features
D Low power consumption: 25 mA / 3 V
(typical at –8 dBm output level)
D 2.5 GHz output frequency
D Excellent sideband suppression by means of duty
cycle regeneration and 90° phase control
D Separate power-down mode for modulator and mixer
D Low LO input level: – 10 dBm (typical)
D LO and RF port 50-W single-ended
Benefits
D Extended talk time due to increased battery life
D Few external components results in cost and board
space saving
D Adjustment free, hence saves time and cost
D One TX Platform for different systems
D Reduced costs and space for battery (3-V operation)
Case: SSO-24 package
Ordering Information:
U2891B-AFS, U2891B-AFSG3 (see page 5)
Block Diagram
BBAi
BBAi
2
3
LO 1
4
Lo - Reg.
f/2f
50 LO 1 5
0°
90°
BBBi
BBBi
22
23
94 8141 e
10,17
GND
ö
Control
GND GND SIF
24 1 6
PDIF PDRF VS
14 13
Voltage
regulator
8, 21, 20
RFO
ȍ
16
19 18
LP 1 LP 2
7 11
IFO IFi
12 9
IFi LO2
15
SRF
Rev. A2: 04.10.1995
50
Advanced Information
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U2891B
Pin Description
GND 1
BBAi 2
BBAi 3
LO 1 4
LO 1 5
SIF 6
IFO 7
VS 8
LO 2 9
GND 10
IFi 11
IFi 12
24 GND
23 BBBi
22 BBBi
21 VS
20 VS
19 LP 1
18 LP 2
17 GND
16 RFO
15 SRF
14 PDIF
13 PDRF
94 8581 e
Absolute Maximum Ratings
Parameters
Supply voltage
Pins 8, 20 and 21
Input voltage Pins 2, 3, 4, 5, 9, 11, 12, 22 and 23
Junction temperature
Storage temperature range
Operating Range
Parameters
Supply voltage
Pins 8, 20 and 21
Ambient temperature range
Thermal Resistance
Junction ambient
Parameters
SSO-24
TELEFUNKEN Semiconductors
Pin Symbol
Function
1 GND Ground
2 BBAi Baseband input B inverse
3 BBAi Baseband input B
4 LO 1 LO 1 input
5 LO 1 LO 1 input inverse
6 SIF Output symmetry IF
7 IFO IF output
8 VS Supply voltage
9 LO 2 LO 2 input
10 GND Ground
11 IFi IF input
12 IFi IF input inverse
13 PDRF Power-down RF
14 PDIF Power-down IF
15 SRF Output symmetry RF
16 RFO RF output
17 GND Ground
18 LP 2 Filter and IF level
adjustment
19 LP 1 Filter and IF level
adjustment
20 VS Supply voltage
21 VS Supply voltage
22 BBBi Baseband input B
23 BBBi Baseband input B inverse
24 GND Ground
Symbol
VS, VSRF
Vi
Tj
Tstg
Symbol
VS, VSRF
Tamb
Symbol
Rthja
Value
6
0 to VS
125
– 40 to + 125
Value
2.7 to 5.5
– 40 to + 85
Value
140
Unit
V
V
°C
°C
Unit
V
°C
Unit
K/W
2 (6)
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Rev. A2: 04.10.1995

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TELEFUNKEN Semiconductors
U2891B
Electrical Characteristics: General Data
Parameters
Power supply
Supply voltage range
Supply current
Test Conditions / Pin
Symbol Min.
Typ.
Max.
Unit
Pin 8, 20 and 21
VS, VSRF
2.7
5.5 V
Pin 8, 20 and 21, VS = 3 V IS, ISRF
25
mA
Electrical Characteristics: I/Q Modulator
Test conditions (unless otherwise specified): VS = 3 V, Tamb = 25°C, referred to test circuit.
System impedance Zo = 50 W, fLO1 = 100 MHz, PLO1 = –10 dBm.
Parameters
Test Conditions / Pin
IF output
Pin 7
Output level
LO1 suppression
RLP = R
Voltage standing wave ratio
Sideband suppression
Baseband inputs Pins 2, 3, 22 and 23
Input voltage range
(differential)
Input impedance
Input frequency
LO1 input
Pins 4 and 5
Frequency range
Input level 1)
Input impedance
Duty cycle range
Power-down mode
Supply current
Settling time
Power down voltage
VPD v 0.5 V Pin 14
CSPD 100 pF,
CLO = 100 pF, CRFo = 1 nF
Pin 14
“Power on”
“Power down”
VS = 3.5 to 5.5 V
VS = 2.7 to 3.5 V
Power down current
Power on
Power down
Symbol
PIFo
LORFo
VSWRIFo
SBSIFo
VBBi
ZBBi
fBBi
fLOi
PLOi
ZiLO
DCRLO1
IPD
tS
VPON
VPDN
IPON
IPDN
Min.
30
0.4
VS – 0.5
VS
Typ.
–8
40
1.4
45
500
150
– 10
tbd.
<5
10
0.15
<1
Note:
1) Required LO level is a function of the LO frequency
Max.
Unit
dBm
dB
2
dB
900 mVpp
kW
200 MHz
500 MHz
– 2 dBm
W
0.6
mA
ms
VS +0.5
VS +0.5
1
V
V
V
mA
mA
Rev. A2: 04.10.1995
Advanced Information
3 (6)