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SL6610
Direct Conversion FSK Data Receiver
Advance Information
Supersedes the October 1994 edition, DS4003 - 1.4
DS4003 - 2.2 September 1995
This device is an advanced direct conversion receiver for
operation up to 470MHz. The design is based on the SL6609A
but is specifically designed for use in very small pagers i.e.
credit card sized, where local oscillator re-radiation is a
problem. This design has overcome this difficulty.
The device also includes a 1 volt regulator capable of
sourcing up to 5mA, a battery flag and the facility of incorporating
a more complex post detection filter off-chip. Both battery flag
and data outputs have open collector outputs to ease their
interface with other devices.
Adjacent channel rejection is provided using tuneable
gyrator filters. To assist operation in the presence of large
interfering signals both RF and audio AGC functions are
provided.
TPX
MIXER DECOUPLE
LOY
GYRI
LOX
VR
TPY
GTHADJ
TCADJ
BEC
BATTFL
TPLIMY
VCC2
DATAOP
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
IAGCOUT
IRFAMP
MIXA
GND
MIXB
VREG
REGCNT
VCC1
VBATT
VBG
DIGGND
BRF1
BRF2
TPLIMX
NP28
FEATURES
s
s
s
s
s
Very low power operation - typ 3.0mW
Superior sensitivity of -130dBm
Operation at wide range of paging data rates
512, 1200, 2400 baud
Small package offering SSOP
Excellent performance of LO Rejection
Fig.1 Pin connections
ABSOLUTE MAXIMUM RATINGS
Supply voltage
Storage temperature
Operating temperature
6V
-55°C to +150°C
-20°C to +70°C
APPLICATIONS
s
s
s
Credit card pagers
Watch pagers
Small form factor pagers i.e. PCMCIA
ORDERING INFORMATION
SL6610 / KG / NPDS
SL6610 / KG / NPDE
- SSOP devices in anti-static sticks
- SSOP devices in tape and reel
Fig.2 Block diagram of SL6610
SL6610
ELECTRICAL CHARACTERISTICS
These characteristics are guaranteed over the following conditions unless otherwise stated:
Tamb = 25°C, VCC1 = 1.3V, VCC2 = 2.7V
Value
Characteristics
Pin
Min
VCC1 - Supply voltage
VCC2 - Supply voltage
ICC1 - Supply current
21
13
21,27,28
0.95
1.8
Typ
1.3
2.7
1.5
Max
2.8
3.5
1.8
V
V
mA
Includes IRF. Does not include
regulator supply. Audio
AGC inactive
Batt flag & Data O/P high
Pin 27 voltage: 0.3 - 1.3V
VCC1 < VCC2 - 0.7 volts
Units
Comments
ICC2 - Supply current
Power down ICC1
Power down ICC2
1 volt regulator
11,13,14
21,27,28
11,13,14
23
0.95
550
700
1
8
µA
µA
µA
V
1.0
1.05
I Load = 3mA. Ext PNP.
ß >= 100, V
CE
= 0.1 volt
Band gap voltage reference
Band gap current source
Voltage reference
Voltage reference sink/source
1 volt regulator load current
Turn on Time
19
19
6
6
1.15
0.93
0.25
1.21
1.0
3
5
1.27
20
1.07
10
5
V
µA
V
µA
mA
ms
VCC1 > 1.1V
Stable data o/p when 3dB above
sensitivity. C
BG
and C
VR
= 2.2µF
Fall to 10% of steady state current
C
BG
and C
VR
= 2.2µF
Turn off Time
1
ms
Detector output current
RF current source
Current Source
(IRF)
17
+/-4
µA
27
400
500
600
µA
Pin 27 voltage: 0.3 - 1.3V
Decoder
Sensitivity
40
µVrms
Signal injected at TPX and TPY
B.E.R. < 1 in 30
5KHz deviation @ 1200 bits/sec
BRF capacitor = 1nF
Output logic low
Output Iogic high
Output mark space ratio
Data O/P Sink Current
Data O/P Leakage Current
14
14
14
7:9
100
9:7
500
1.0
µA
µA
2
SL6610
ELECTRICAL CHARACTERISTICS
These characteristics are guaranteed over the following conditions unless otherwise stated:
Tamb = 25°C, VCC1 = 1.3V, VCC2 = 2.7V
Value
Characteristics
Pin
Min
Battery Economy
Input logic high
Input logic low
Input current
Input current
Battery Flag Input
Input current
Battery Flag Output
Battfl Sink Current
Battfl leakage current
Mixers
Gain to "IF Test"
RF input impedance
LO input impedance
LO DC bias voltage
Audio AGC
Max Audio AGC Sink Current
24, 26
3, 5
3, 5
Typ
Max
Units
Comments
10
10
10
10
(V
CC2
- 0.3)
0.05
6
0.3
1
8
V
V
µA
µA
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20
1
µA
11
11
50
500
1
µA
µA
(VBATT-VR) > 20mV
(VBATT-VR) < -20mV
34
41
dB
V
LO inputs driven in parallel with
50mVRMS @ 50MHz.IF = 2kHz
See Figs.8a, 8b
See Fig.9
Equal to Pin 21 (VCC1)
28
45
65
85
µA
RECEIVER CHARACTERISTICS (Demonstration board)
Measurement conditions unless stated V
CC1
= 1.3V, V
CC2
= 2.7V, LNA = 18dB Power Gain, 2dB Noise figure,
Carrier frequency 153MHz, BER 1 in 30, Tamb = 25°C
(TPx/TPy typically:- 160mV
PP
± 10% for - 73dBm RF input to the LNA)
Value
Characteristics
Pin
Min
Sensitivity
-130
Typ
-128
Max
-125
dBm
1200 bps
∆f
= 4kHz
LO = -18dBm
1200 bps
∆f
= 4kHz
LO = -18dBm
1200 bps
∆f
= 4kHz
LO = -18dBm
Channel spacing 25kHz
1200 bps
∆f
= 4kHz
LO = -18dBm
1200 bps
∆f
= 4kHz
LO = -18dBm
Units
Comments
Intermodulation
52
56
dB
Adjacent channel
68
73
dB
Centre frequency acceptance
+/-2.3
kHz
Deviation acceptance
+/-2.2
kHz
3
SL6610
RECEIVER CHARACTERISTICS (Demonstration board)
Measurement conditions unless stated V
CC1
= 1.3V, V
CC2
= 2.7V, LNA = 20dB Power Gain, 2dB Noise figure,
Carrier frequency 282MHz, BER 1 in 30, Tamb = 25°C
(TPx/TPy typically:- 160mV
PP
± 10% for - 73dBm RF input to the LNA)
Value
Characteristics
Pin
Min
Sensitivity
-130
Typ
-128
-125.5
Max
-125
-122
dBm
dBm
1200 bps
∆f
= 4kHz
2400 bps
∆f
= 4.5kHz
LO = -15dBm
1200 bps
∆f
= 4kHz
2400 bps
∆f
= 4.5kHz
LO = -15dBm
1200 bps
∆f
= 4kHz
LO = -15dBm
1200 bps
∆f
= 4kHz
2400 bps
∆f
= 4.5kHz
LO = -15dBm
Channel spacing 25kHz
1200 bps
∆f
= 4kHz
2400 bps
∆f
= 4.5kHz
LO = -15dBm
1200 bps
∆f
= 4kHz
2400 bps
∆f
= 4.5kHz
LO = -15dBm
Units
Comments
Intermodulation (IP3)
52
49
56
53.5
dB
Intermodulation (IP2)
47
52
dB
Adjacent channel
67
64
72.5
69.5
dB
Centre frequency acceptance
+/-1.9
+/-2.3
+/-2
kHz
Deviation acceptance
+/-2.2
+/-2
kHz
RECEIVER CHARACTERISTICS
Measurement conditions unless stated V
CC1
= 1.3V, V
CC2
= 2.7V, LNA = 22dB Power Gain, 2dB Noise figure,
Carrier frequency 470MHz, BER 1 in 30, Tamb = 25°C
(TPx/TPy typically:- 140mV
PP
± 10% for - 73dBm RF input to the LNA)
Value
Characteristics
Pin
Min
Sensitivity
-128
Typ
-126
Max
-123
dBm
1200 bps
∆f
= 4kHz
LO = -15dBm
1200 bps
∆f
= 4kHz
LO = -15dBm
1200 bps
∆f
= 4kHz
LO = -15dBm
Channel spacing 25kHz
1200 bps
∆f
= 4kHz
LO = -15dBm
1200 bps
∆f
= 4kHz
LO = -15dBm
Units
Comments
Intermodulation
50
55.5
dB
Adjacent channel
67
72.5
dB
Centre frequency acceptance
+/- 2.3
kHz
Deviation acceptance
+/- 2.2
kHz
4
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