MITEL SL6679, SL6679KG, SL6679TP1N, SL6679TP1Q Datasheet

SL6679

Direct Conversion FSK Data Receiver

Preliminary Information

Supersedes September 1996 version, DS4410 - 1.5 DS4410 - 2.1 April 1998

The SL6679 is an advanced Direct Conversion FSK Data
Receiver for operation up to 450 MHz. The device integrates all
functions to convert a binary FSK modulated RF signal into a
demodulated data stream.

Adjacent channel rejection is provided using tuneable gyrator
filters. RF and audio AGC functions assist operation when large
interfering signals are present and an automatic frequency control
(AFC) function is provided to extend centre frequency acceptance.

FEATURES

■ Very Low Power Operation from Single Cell

■ Superior Sensitivity

■ Operation at 512, 1200 and 2400 Baud

■ On Chip 1 Volt Regulator

■ 1mm Height Miniature Package

■ Automatic Frequency Control Function

■ Programmable Post Detection Filter

■ AGC Detection Circuitry

■ Power Down Function

■ Battery Strength Indicator

GTH ADJ

32 31 30 29 28 27 26 25

IRF

GND

MIXIP A

MIX DEC

MIXIP B

REG CNT

V

REG

TPI

1
2
3
4
5
6
7
8

9 10111213141516

I1

Fig. 1 Pin identification diagram (top view). See Table 1 for

pin descriptions

TC ADJ

IAGC OP

TP LIM I

SL6679

1

I2

CC

V

LOIP I

BATT

V

BRF1

GYR I

LOIP Q

BRF CNT

AFC2

24
23
22
21
20
19
18
17

Q1

Q2

AFC1
BATT FLAG
VCC2
DATA OP
BEC
AFC OP
V

REF

TPQ

TP32

APPLICATIONS

■ Pagers, including Credit Card, PCMCIA and

Watch Pagers

■ Low Data Rate Receivers, e.g. Security Systems

ORDERING INFORMATION

SL6679/KG/TP1N 1mm TQFP device, baked and dry

packed, supplied in trays

SL6679/KG/TP1Q 1mm TQFP device, baked and dry

3

5

packed, supplied in tape and reel

12 9

MIXER

10 13 7 6 8 29 4 20 11 22 2 18

−
+

1·0V

−

1·08V

+

ABSOLUTE MAXIMUM RATINGS

Storage temperature
Operating temperature
Maximum voltage on any pin w.r.t. any
other pin, subject to the following conditions:

Current, pin 3 (MIXIP), pin 5 (MIXPB),
pin 12 (LOIPI) and pin 14 (LOIPB)

Most negative voltage on any pin

MIX

LIMITER

BEC VCC1 VCC2 GND V

DEC

4

f

DETECTOR

LIMITER

AFC

REF

255°C to1150°C

210°C to155°C

14V

<5ma

20·5V w.r.t. gnd

26
27

21

31
30

19

14 15 16 28 23 17 1 32 24 25

Fig. 2 Block diagram of SL6679

SL6679

Pin number

1
2
3
4
5
6
7
8

9
10
11
12
13
14

Pin name

IRF

GND
MIXIP A
MIX DEC
MIXIP B
REG CNT
VREG
TPI
I1
I2
VCC1
LOIP I
GYRI
LOIP Q

Pin description

LNA current source
Ground
Mixer input A
Mixer biasing decouple
Mixer input B
1V regulator control external PNP drive
1V regulator output voltage
I channel pre-gyrator filter test point.
Mixer output, I channel
Mixer output, I channel
Positive supply 1
LO input channel I
Gyrator current adjust pin

LO input channel Q
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30

Q1
Q2
TPQ
VREF
AFC OP
BEC
DATA OP
VCC2
BATT FLAG
AFC1
AFC2
BRF CNT
BRF1
VBATT
TP LIM I
IAGC OP

Mixer output, Q channel

Mixer output, Q channel

Q channel pre-gyrator filter test point

Reference voltage

AFC output

Battery economy control

Data output pin

Positive supply 2

Battery flag output

AFC characteristic defining pin

AFC characteristic defining pin

Bit rate filter control

Bit rate filter 1, output from detector

Battery flag input voltage

I channel limiter (post gyrator filter) test point, output only

Audio AGC output current
31
32

TC ADJ
GTH ADJ

Audio AGC time constant adjust

Audio AGC gain and threshold adjust. RSSI signal indicator

Table 1 SL6679 pin descriptions

2

ELECTRICAL CHARACTERISTICS (1)

Electrical Characteristics (1) are guaranteed over the following range of operating conditions unless otherwise stated

T

= 125°C, VCC1 = 1·3V, VCC2 = 2·7V

AMB

Value

Characteristic

Pin

Min.

Typ. Max.

ConditionsUnits

SL6679

Supply voltage, VCC1
Supply voltage, V
Supply current, I
Supply current, I
1 volt regulator, V

CC
CC

CC

1
2

REG

2

1 volt regulator load current
LNA current source, IRF
Reference voltage, V
V

source current

REF

V

sink current

REF

REF

Data Amplifier

DATA OP sink current
DATA OP leakage current
Output mark:space ratio

Battery Economy

Power down I
Power down I

CC
CC

1

2
BEC input logic high
BEC input logic low
BEC input current
BEC input current

11
22
11
22

18
18
18

21
21
21

11
22
20
20
20
20

0·95

1·9

1·20

260
7
7
1

0·95
0·25

375

1·15

1·3
2·7

1·60

390

1·0

500

1·25

25

7:9

2·7
3·5
2·2

490

1·05

3

700

1·31

20

1·0

1·0
9:7

VCC1<VCC220·8V

V
V

mA

Including IRF

µA

V

mA

µA

V

= 3mA, external PNP(b>100, V

I

LOAD

External PNP (h

>100, V

FE

CE

PTAT, voltage on pin 1 = 0·3V and 1·3V
Typical temperature coefficient = 10·1mV/°C

µA
µA

µA

Output logic low, pin 21 voltage = 0·3V

µA

Output logic high, pin 21 voltage = V
Preamble at 1200 baud, Df = 4kHz,

= 0·1V)

CE

CC

= 0·1V)

2

pin 26 = 0V, BRF capacitor = 560pF,
DATA OP pullup resistor = 200kΩ

V

220·3V

CC

21·0
21·0

V

10
10

CC

0·3

0·5
2·0

0

1·0
1·0

µA

Pin 20 = logic low

µA

Pin 20 = logic low
V
V

µA
µA

Powered up

Powered down

Powered up

Powered down

2

Battery Flag

V

trigger point

BATT

BATT FLAG sink current
BATT FLAG sink current
BATT FLAG sink current
V

input voltage

BATT

V

input current

BATT

V

input current

BATT

28
23
23
23
28
28
28

1·04

1·0

25

21·0
21·0

1·08

1·12

1·0

2·0
1·0
1·0

V

Current sunk by pin 23 = 1µA

µA

Pin 28 voltage = 1·04V

µA

Pin 28 voltage = 1·12V

µA

Pin 28 voltage = 1·14V
V

µA

V

= 1·14V

BATT

µA

V

= 1·04V

BATT

Continued…

3

SL6679

ELECTRICAL CHARACTERISTICS (1) (Cont.)

Electrical Characteristics (1) are guaranteed over the following range of operating conditions unless otherwise stated

T

= 125°C, VCC1 = 1·3V, VCC2 = 2·7V

AMB

Value

Characteristic

Mixers

LO DC bias voltage
Gain to TPI

Gain to TPQ

Match of gain to TPI
and TPQ

Audio AGC

IAGC OP max. sink current
IAGC OP leakage current

AFC

AFC DC current, I

AFC4k5

AFC DC current

AFC DC current

Pin

12,14

3,5,8,12

3,5,14,

17

3,5,8,

12,14,17

30
30

19
19

19

Min.

38

38

21

I

AFC4k5

10·2

Typ.

V

CC

42

42

0

45

0·0

I

AFC4k5

10·7

I

AFC4k5

20·9

Max.

1

46

Units

V

dB

LO inputs (12, 14) driven in quadrature:
45mVrms at 450MHz, CW.
Mixer inputs (3, 5) driven differentially:
0·45mVrms at 450·004MHz, CW.

46

11

1

I

AFC4k5

dB

dB

µA
µA

µA
µA

µA

As gain to TPI

As gain toTPI

TPI, TPQ signals limiting
No signal applied

f

= fLO14·5kHz, CW

C

f

= fLO12·5kHz, CW

C

= fLO16·5kHz, CW

f

C

20·2

Conditions

Bit Rate Filter Control

BRF CNT input logic high

BRF CNT input logic low
Tristate I/P current window
BRF 1 output current
BRF 1 output current
BRF 1 output current
BRF CNT input high current
BRF CNT input low current

26

26
26
27
27
27
26
26

V

CC

20·3

0

20·4

27·5
27·5

V

2

VCC2

0·1

10·4
3·5
1·7

0·74

115

17·5

µA
µA
µA
µA
µA
µA

2400 baud

V

1200 baud
512 baud
Pin 26 logic high
Pin 26 logic low
Pin 26 logic tristate (open circuit)

4

ELECTRICAL CHARACTERISTICS (2)

Electrical Characteristics (2) are guaranteed over the following range of operating conditions unless otherwise stated.
Characteristics are tested at room temperature only and are guaranteed by characterisation test or design.

T

= 210°C to 155°C, VCC1 = 1·4V to 2·0V, VCC2 = 2·3V to 3·2V. VCC1,VCC220·8V

AMB

Value

Characteristic

Pin

Min.

Typ. Max.

ConditionsUnits

SL6679

Supply voltage, VCC1
Supply voltage, V
Supply current, I
Supply current, I
1 volt regulator, V

CC
CC

CC

1
2

REG

2

1 volt regulator load current
LNA current source, IRF
Reference voltage, V
V

source current

REF

V

sink current

REF

REF

Turn-on time

Turn-off time

Data Amplifier

DATA OP sink current
DATA OP leakage current
Output mark:space ratio

Battery Economy

Power down I
Power down I

CC
CC

1

2
BEC input logic high
BEC input logic low
BEC input current
BEC input current

11
22
11
22

18
18
18

21
21
21

11
22
20
20
20
20

0·95

1·9

1·3
2·7

1·60

350
7
7
1

0·93
0·25

375

1·13

1·0

500

1·25

22

7:9

2·7
3·5
2·4

510

1·05

3

800

1·33

18

0·8

9

2

1·5
9:7

VCC1<VCC220·8V at >25°C only

V
V

mA

Including IRF

µA

V

mA

µA

V

= 3mA, external PNP(b>100, V

I

LOAD

External PNP(h

>100, V

FE

CE

PTAT, voltage on pin 1 = 0·3V and 1·3V
Typical temperature coefficient = 10·1mV/°C

µA
µA

ms

Stable data O/P when 3dB above sensitivity.
C

= 2·2µF

VREF

ms

Fall to 10% of steady state I

µA

Output logic low, pin 21 voltage = 0·3V

µA

Output logic high, pin 21 voltage = V
Preamble at 1200 baud, Df = 4kHz,

= 0·1V)

1. C

CC

VREF

CC

= 0·1V)

CE

= 2·2µF

2

pin 26 = 0V, BRF capacitor = 560pF,
DATA OP pullup resistor = 200kΩ

V

220·3V

CC

21·5
21·5

V

12
12

CC

0·3

0·5
2·0

0

1·5
1·5

µA

Pin 20 = logic low

µA

Pin 20 = logic low
V
V

µA
µA

Powered up

Powered down

Powered up

Powered down

2

Battery Flag

V

trigger point

BATT

BATT FLAG sink current
BATT FLAG sink current
BATT FLAG sink current
V

input voltage

BATT

V

input current

BATT

V

input current

BATT

28
23
23
23
28
28
28

1·04

2

20

21·5
21·5

1·08

1·12

2

2·0
1·5
1·5

V

Current sunk by pin 23 = 1µA

µA

Pin 28 voltage = 1·04V

µA

Pin 28 voltage = 1·12V

µA

Pin 28 voltage = 1·14V
V

µA

V

= 1·14V

BATT

µA

V

= 1·04V

BATT

Continued…

5

SL6679

ELECTRICAL CHARACTERISTICS (2) (Cont.)

Electrical Characteristics (2) are guaranteed over the following range of operating conditions unless otherwise stated.
Characteristics are tested at room temperature only and are guaranteed by characterisation test or design.

T

= 210°C to 155°C, VCC1 = 1·4V to 2·0V, VCC2 = 2·3V to 3·2V. VCC1,VCC220·8V

AMB

Value

Characteristic

Mixers

LO DC bias voltage
Gain to TPI

Gain to TPQ

Match of gain to TPI
and TPQ

Audio AGC

IAGC OP max. sink current
IAGC OP leakage current

Pin

12,14

3,5,8,12

3,5,14,

17

3,5,8,

12,14,17

30
30

Min.

35

35

21·5

30

Typ.

V

CC

42

42

0

45

Max.

1

46

Units

V

dB

LO inputs (12, 14) driven in quadrature:
45mVrms at 450MHz, CW.
Mixer inputs (3, 5) driven differentially:
0·45mVrms at 450·004MHz, CW.

46

11·5

70

1

dB

dB

µA
µA

As gain to TPI

As gain toTPI

TPI, TPQ signals limiting
No signal applied

Conditions

AFC

AFC DC current, I

AFC4k5

AFC DC current

AFC DC current

Bit Rate Filter Control

BRF CNT input logic high

BRF CNT input logic low
Tristate I/P current window
BRF 1 output current
BRF 1 output current
BRF 1 output current
BRF CNT input high current
BRF CNT input low current

19
19

19

26

26
26
27
27
27
26
26

I

AFC4k5

10·1

V

CC

20·3

0

20·4

210
210

0·0

I

AFC4k5

µA
µA

f

= fLO14·5kHz, CW

C

f

= fLO12·5kHz, CW

C

10·7

I

AFC4k5

20·9

2

I

AFC4k5

20·1

VCC2

0·1

10·4
3·5
1·7

0·74

110
110

µA

V

V

µA
µA
µA
µA
µA
µA

= fLO16·5kHz, CW

f

C

2400 baud

1200 baud
512 baud
Pin 26 logic high
Pin 26 logic low
Pin 26 logic tristate (open circuit)

6

SL6679

RECEIVER CHARACTERISTICS (450MHz)

Receiver Characteristics (450MHz) are guaranteed over the following range of operating conditions unless otherwise stated.
Characteristics are not tested but are guaranteed by characterisation test or design. All measurements made using the
characterisation circuit Fig. 5. See Application Note AN137 for details of test method.

T

= 210°C to 155°C, VCC1 = 1·04V to 2·0V, VCC2 = 2·3V to 3·2V, VCC1,VCC220·8V, carrier frequency = 450MHz,

AMB

BER = 1 in 30, AFC open loop. LNA gain set such that an RF signal of273dBm at the LNA input, offset from the LO
by 4kHz, gives a typical IF signal level of 300mV p-p at TPI and TPQ. LNA noise figure,2dB

Value

Characteristic

Min.

Typ.

Max.

Units

Conditions

Sensitivity

Intermodulation, IP3

Adjacent Channel

Deviation Acceptance

Up
Down
Up
Down
Up
Down

Centre Frequency Acceptance

50
48

62·5

60

11·8
22·7
11·7

23

62·0
62·0

2128
2126
2123

57
55
53

70
69
66

11·9
22·5
13·0
22·3
12·5
22·3

62·8
62·5
62·5

2122
2119

14·6
21·7
14·6
21·7

62·9
63·2

dBm
dBm
dBm

dB
dB
dB

dB
dB
dB

kHz
kHz
kHz
kHz
kHz
kHz

kHz
kHz
kHz

512bps, Df = 4·5kHz
1200bps, Df = 4·0kHz
2400bps, Df = 4·5kHz. LO = 215dBm

512bps, Df = 4·5kHz
1200bps, Df = 4·0kHz
2400bps, Df = 4·5kHz. LO = 215dBm. Channel
spacing 25kHz

512bps, Df = 4·5kHz
1200bps, Df = 4·0kHz
2400bps, Df = 4·5kHz. LO = 215dBm. Channel
spacing 25kHz

512bps, Df = 4·5kHz, no AFC
512bps, Df = 4·5kHz, no AFC
1200bps, Df = 4·0kHz, no AFC
1200bps, Df = 4·0kHz, no AFC
2400bps, Df = 4·5kHz, no AFC
2400bps, Df = 4·5kHz, no AFC

512bps, Df = 4·5kHz, no AFC
1200bps, Df = 4·0kHz, no AFC
2400bps, Df = 4·5kHz, no AFC

AFC Capture Range (AFC
Closed Loop)

64

63·5

64

kHz
kHz
kHz

512bps, Df = 4·5kHz. All at sensitivity 13dB or above
1200bps, Df = 4·0kHz. All at sensitivity 13dB or above
2400bps, Df = 4·5kHz. All at sensitivity 13dB or above

7