ATMEL T2801-PLH Datasheet

DECT Single-Chip Transceiver

Description

The T2801 is an RF IC for low-power DECT appli­cations. The HP-VFQFP-N48-packaged IC is a complete
transceiver including image rejection mixer, IF amplifier,
FM demodulator, baseband filter, RSSI, TX preamplifier,
power-ramping generator for power amplifiers, inte­grated synthesizer, fully integrated VCO, TX filter and

Features

 Supply-voltage range 3 V to 4.6 V (unregulated)

T2801

modulation compensation circuit for advanced closed­loop modulation concept. No mechanical tuning is
necessary in production.

Electrostatic sensitive device.
Observe precautions for handling.

 Non-blindslot and blindslot operation
 Auxiliary-voltage regulator on-chip
 Low current consumption
 Few low cost external components
 No mechanical tuning required

Block Diagram

MIXER
OUT

IR MIXER

RF_IN

RAMP_OUT

RAMP_SET

TX_OUT

PU_VCO

RAMP
GEN

TX / RX
SWITCH

PC

TX DRIVER

VCO
REG

IF_IN

f

: n

AUX
REG

IF_TANK

IF AMP 1 IF AMP 2

VCO

 Unlimited multislot operation with advanced closed-

loop modulation

 Supports multiple reference clocks (10.368 MHz/

13.824 MHz/ 20.736 MHz)

 TX preamplifier with 0 dBm output power at 1.9 GHz

and ramp-signal generator for SiGe power amplifier

PD

CP

RSSI

DEMOD

GF

TANK

D/A

DEMOD

DEMOD DAC

f

: n

MCC

RC

CF

BB FILTER

3-WIRE
BUS

CTRL
LOGIC

BB_OUT

RSSI

TX_DATA

CLOCK
DATA
ENABLE

RX_ON
TX_ON
PU_RX/TX
PU_PLL

VREG_VCO

VS_VCO CP LD REF_CLKVTUNEVREG VS_REG

PU_REGGND_VCO

REG_CTRL

I_CPSW

Figure 1. Block diagram

Ordering Information

Extended Type Number Package Remarks

T2801-PLH HP-VFQFP-N48 Taped and reeled

Rev. A9, 11-Dec-01 1 (27)

Preliminary Information

T2801

Functional Block Description

Name Description

AUX REG Auxiliary voltage regulator
BBF Baseband filter
CP Charge pump
DAC D/A converter for demodulator tuning
DEMOD Demodulator
GF Gaussian filter for transmit data
IF AMP1 1st intermediate frequency amplifier
IF AMP2 2nd intermediate frequency amplifier
IR MIXER Image rejection mixer
MCC Modulation compensation circuit

Pinning

TX_DATA

I_CPSW

48 47 46 45 44 43 42 41 40 39 38 37

PU_RX/TX

PU_PULL

PU_VCO

GND_PLL

Name Description

PC Programmable counter
PD Phase detector
RAMP GEN Ramp-signal generator
RC Reference counter
RSSI Received signal-strength indicator
TX DRIVER Buffer amplifier for TX_OUT
TX/RX

SWITCH

Switches VCO signal to IR MIXER

resp. TX DRIVER
VCO Voltage-controlled oscillator
VCO REG Voltage regulator for VCO

RX_ON

TX_ON

VS_MIXER

MIXER_OUT1

MIXER_OUT2

RAMP_SET

CLOCK

DATA

ENABLE

REF_CLK

LD

PU_REG

VS_PLL

VREG

REG_CTRL

VS_REG
GND_CP

VS_CP

1
2
3
4
5
6
7
8
9
10
11
12

13 14 15 16 17 18 19 20 21 22 23 24

CP

VS_VCO

T2801

VTUNE

GND_VCO

VREG_VCO

GND1

DEMOD_TANK1

DEMOD_TANK2

REG_DEC

DAC_DEC

BB_CF

BB_OUT

36
35
34
33
32
31
30
29
28
27
26
25

RAMP_OUT
IF_IN2

IF_IN1
VS_IF

TX_OUT
GND3
RF_IN2
RF_IN1
GND2

IF_TANK2
IF_TANK1
RSSI

2 (27)

Figure 2. Pinning

Rev. A9, 11-Dec-01

Preliminary Information

Pin Description

ENABLE

Pin Symbol Function Configuration

1 CLOCK 3-wire-bus: Clock input

2 DATA 3-wire-bus: Data input

3 ENABLE 3-wire-bus: Enable input

VS_PLL

7

CLOCK

DATA

ENABLE

1,2,3

GND_PLL

43

5k 5k

T2801

4 REF_CLK Reference-frequency input

5 LD Lock-detect output

6 PU_REG Power-up input for aux. voltage

regulator

VS_PLL

7

REF_CLK

4

GND_PLL

43

GND_PLL

PU_REG

6

43

10k

100

25k 25k

10k

LD

5

GND_PLL

43

Rev. A9, 11-Dec-01 3 (27)

Preliminary Information

T2801

Pin Description (continued)

Pin Symbol Function Configuration

7 VS_PLL PLL supply voltage

VS_PLL

7

VS_REG

10

VS_CP

12

VS_VCO

14

GND1

18

GND2

28

GND3

31

8 VREG Aux. voltage-regulator output

9 REG_CTRL Aux. voltage-regulator control

output

10 VS_REG Aux. voltage-regulator supply

voltage

VS_IF

33

VS_MIXER

42

GND_VCO

16

GND_CP

11

GND_PLL

43

VS_REG

10

REG_CTRL

9

VREG

8

11 GND_CP Charge-pump ground

12 VS_CP Charge-pump supply voltage

13 CP Charge-pump output

4 (27)

Preliminary Information

GND_PLL

43

VS_CP

12

CP

13

GND_CP

11

Rev. A9, 11-Dec-01

Pin Description (continued)

Pin Symbol Function Configuration

14 VS_VCO VCO voltage-regulator supply

voltage

T2801

VS_VCO

14

15 VREG_VCO VCO voltage-regulator control

output

16 GND_VCO VCO ground

17 VTUNE VCO tuning voltage input

18 GND1 Ground

VREG_VCO

15

VTUNE

17

GND_VCO

16

VS_PLL

7

VS_REG

10

VS_CP

12

VS_VCO

14

VREG_VCO

15

GND_VCO

16

GND1

18

GND2

28

GND3

31

VS_IF

33

VS_MIXER

42

GND_VCO

16

GND_CP

11

GND_PLL

43

Rev. A9, 11-Dec-01 5 (27)

Preliminary Information

T2801

Pin Description (continued)

Pin Symbol Function Configuration

19 DEMOD_TANK1 Demodulator tank circuit

VS_MIXER

42

10k 10k

20 DEMOD_TANK2 Demodulator tank circuit

21 DAC_DEC Decoupling PIN for VCO_DAC

22 REG_DEC Decoupling PIN for VCO_REG

DEMOD_

TANK1

19

GND1

18

VREG_VCO

DAC_DEC

GND_VCO

VREG_VCO

DEMOD_

TANK2

20

15

10k

21

400

16

15

2k

23 BB_CF Baseband filter corner-frequency

control input

6 (27)

Preliminary Information

REG_DEC

22

42k

GND_VCO

16

VS_IF

33

BB_CF

23

GND1

18

Rev. A9, 11-Dec-01

Pin Description (continued)

Pin Symbol Function Configuration

24 BB_OUT Baseband filter output

25 RSSI Received signal-strength indicator

output

26 IF_TANK1 IF tank circuit

VS_IF

33

GND1

18

13k

T2801

BB_OUT

24

VS_IF

33

RSSI

25

GND2

28

VS_IF

33

27 IF_TANK2 IF tank circuit

28 GND2 Ground

IF_TANK1

26

VS_PLL

7

VS_REG

10

VS_CP

12

VS_VCO

14

VS_IF

33

VS_MIXER

42

IF_TANK2

27

GND2

28

GND1

18

GND2

28

GND3

31

GND_VCO

16

GND_CP

11

GND_PLL

43

Rev. A9, 11-Dec-01 7 (27)

Preliminary Information

T2801

RF_IN1

RF_IN2

Pin Description (continued)

Pin Symbol Function Configuration

29 RF_IN1 RF input of image reject mixer

VS_MIXER

42

30 RF_IN2 RF input of image reject mixer

31 GND3 Ground

RF IN1

29

GND2

28

VS_PLL

7

VS_REG

10

VS_CP

12

VS_VCO

14

VS_IF

33

VS_MIXER

42

RF IN2

30

GND1

18

GND2

28

GND3

31

GND_VCO

16

GND_CP

11

GND_PLL

43

32 TX_OUT TX driver amplifier output for PA

8 (27)

Preliminary Information

TX_OUT

32

GND3

31

Rev. A9, 11-Dec-01

Pin Description (continued)

IF_IN1

IF_IN2

4.3k

Pin Symbol Function Configuration

33 VS_IF IF amplifier supply voltage

T2801

34 IF_IN1 IF input of IF amplifier

35 IF_IN2 IF input of IF amplifier

VS_PLL

7

VS_REG

10

VS_CP

12

VS_VCO

14

VS_IF

33

VS_MIXER

42

IF IN1 IF IN2

34

GND1

GND2

GND3

GND_VCO

GND_CP

GND_PLL

VS_IF

18

28

31

16

11

43

33

35

GND2

28

36 RAMP_OUT Ramp-generator output for PA

power ramping

Rev. A9, 11-Dec-01 9 (27)

VS_MIXER

42

RAMP_OUT

36

GND2

28

Preliminary Information