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TEMIC Semiconductors
TEMIC Semiconductors

U2891B Datasheet Preview

U2891B Datasheet

2.5 GHz Quadrature Up-Converter

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U2891B pdf
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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
1 (6)



TEMIC Semiconductors
TEMIC Semiconductors

U2891B Datasheet Preview

U2891B Datasheet

2.5 GHz Quadrature Up-Converter

No Preview Available !

U2891B pdf
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)
Advanced Information
Rev. A2: 04.10.1995


Part Number U2891B
Description 2.5 GHz Quadrature Up-Converter
Maker TEMIC Semiconductors
Total Page 6 Pages
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