Datasheet MC13155D Datasheet (Motorola)

  

The MC13155 is a complete wideband FM detector designed for satellite
TV and other wideband data and analog FM applications. This device may
be cascaded for higher IF gain and extended Receive Signal Strength
Indicator (RSSI) range.

• 12 MHz Video/Baseband Demodulator

• Ideal for Wideband Data and Analog FM Systems

• Limiter Output for Cascade Operation

• Low Drain Current: 7.0 mA

• Low Supply Voltage: 3.0 to 6.0 V

• Operates to 300 MHz

Order this document by MC13155/D



WIDEBAND FM IF

SEMICONDUCTOR

TECHNICAL DATA

MAXIMUM RATINGS

Rating Pin Symbol Value Unit

Power Supply Voltage 11, 14 VEE (max) 6.5 Vdc
Input Voltage 1, 16 V
Junction Temperature – T
Storage Temperature Range – T

NOTE: Devices should not be operated at or outside these values. The “Recommended

Operating Conditions” provide for actual device operation.

in

J

stg

1.0 Vrms

+150 °C

– 65 to +150 °C

Figure 1. Representative Block Diagram

Buffered

Input

Input

16

RSSI

Decouple

1

Output

15

Three Stage

Amplifier

RSSI

Output

Limiter
Output

101213

9

Detector

8

Quad
Coil

Input

Decouple

VCC1
Output
Output

VCC2

Limiter Out

Quad Coil

16

1

D SUFFIX

PLASTIC PACKAGE

CASE 751B

(SO–16)

PIN CONNECTIONS

1
2
3
4
5
6
7
8

(Top View)

16
15
14
13
12
11
10

9

Input
Decouple
VEE1

RSSI Buffer
RSSI
VEE2

Limiter Out
Quad Coil

7542

Decouple

NOTE: This device requires careful layout and decoupling to ensure stable operation.

Balanced

Outputs

Limiter
Output

MOTOROLA ANALOG IC DEVICE DATA

ORDERING INFORMATION

Operating

Device

MC13155D TA = – 40 to +85°C SO–16

 Motorola, Inc. 1996 Rev 1

Temperature Range

Package

1

MC13155

RECOMMENDED OPERATING CONDITIONS

Rating Pin Symbol Value Unit

Power Supply Voltage (TA= 25°C) 11, 14 V

–40°C ≤ TA ≤ 85°C 3, 6 V
Maximum Input Frequency 1, 16 f
Ambient Temperature Range – T

EE
CC

in

J

– 3.0 to – 6.0 Vdc

Grounded

300 MHz

– 40 to + 85 °C

DC ELECTRICAL CHARACTERISTICS (T

Characteristic

Drain Current 11 I

(VEE = – 5.0 Vdc) 14 I

(VEE = – 5.0 Vdc) 14 I
Drain Current Total (see Figure 3) 11, 14 I

(VEE = – 5.0 Vdc) 5.0 7.5 10.5

(VEE = – 6.0 Vdc) 5.0 7.5 10.5

(VEE = – 3.0 Vdc) 4.7 6.6 9.5

AC ELECTRICAL CHARACTERISTICS (T

Characteristic

Input for – 3 dB Limiting Sensitivity 1, 16 – 1.0 2.0 mVrms
Differential Detector Output Voltage (Vin = 10 mVrms) 4, 5 mV

(f

= ± 3.0 MHz) (VEE = – 6.0 Vdc) 470 590 700

dev

Detector DC Offset Voltage 4, 5 –250 – 250 mVdc
RSSI Slope 13 1.4 2.1 2.8 µA/dB
RSSI Dynamic Range 13 31 35 39 dB
RSSI Output 12 µA

(Vin = 100 µVrms) – 2.1 –

(Vin = 1.0 mVrms) – 2.4 –

(Vin = 10 mVrms) 16 24 36

(Vin = 100 mVrms) – 65 –

(Vin = 500 mVrms) – 75 –
RSSI Buffer Maximum Output Current (Vin = 10 mVrms) 13 – 2.3 – mAdc
Differential Limiter Output mVrms

(Vin = 1.0 mVrms) 7, 10 100 140 –

(Vin = 10 mVrms) – 180 –
Demodulator Video 3.0 dB Bandwidth 4, 5 – 12 – MHz
Input Impedance (Figure 14) 1, 16

@ 70 MHz Rp (VEE = – 5.0 Vdc) – 450 – Ω

@ 70 MHz Cp (C2=C15 = 100 p) – 4.8 – pF

Differential IF Power Gain 1, 7, 10, 16 – 46 – dB

NOTE: Positive currents are out of the pins of the device.

(VEE = – 5.0 Vdc) 450 570 680
(VEE = – 3.0 Vdc) 380 500 620

= 25°C, no input signal.)

A

Pin Symbol Min Typ Max Unit

11
14
14

Total

= 25°C, fIF = 70 MHz, VEE = – 5.0 Vdc Figure 2, unless otherwise noted.)

A

2.0 2.8 4.0 mA

3.0 4.3 6.0

3.0 4.3 6.0

5.0 7.1 10 mA

Pin Min Typ Max Unit

p–p

2

MOTOROLA ANALOG IC DEVICE DATA

MC13155

CIRCUIT DESCRIPTION

The MC13155 consists of a wideband three–stage limiting
amplifier, a wideband quadrature detector which may be
operated up to 200 MHz, and a received signal strength

Figure 2. T est Circuit

1.0n

V

in

Video

Output

Limiter 1

Output

49.9

1.0n

330

1

2

3

4

5

6

7

8

IN1

DEC1

VCC1

DETO1

DETO2

VCC2

LIMO1

indicator (RSSI) circuit which provides a current output
linearly proportional to the IF input signal level for
approximately 35 dB range of input level.

IN2

DEC2

VEE1

RSSI

Buffer

RSSI

VEE2

LIMO2

QUAD2QUAD1

16

15

14

13

12

11

10

1.0n

10n

1.0n

1.0n

1.0n

1.0n

9

100n

1.0k

100n

330

27

Limiter 2
Output

10

10

V

µ

µ

EE

+

V

EE

V

EE

+

APPLICATIONS INFORMATION

Evaluation PC Board

The evaluation PCB shown in Figures 19 and 20 is very
versatile and is designed to cascade two ICs. The center
section of the board provides an area for attaching all surface
mount components to the circuit side and radial leaded
components to the component ground side of the PCB (see
Figures 17 and 18). Additionally, the peripheral area
surrounding the RF core provides pads to add supporting
and interface circuitry as a particular application dictates.
This evaluation board will be discussed and referenced in
this section.

Limiting Amplifier

Differential input and output ports interfacing the three
stage limiting amplifier provide a differential power gain of
typically 46 dB and useable frequency range of 300 MHz.
The IF gain flatness may be controlled by decoupling of the
internal feedback network at Pins 2 and 15.

499

20p

L1

260n

L1 – Coilcraft part number 146–09J08S

Scattering parameter (S–parameter) characterization of
the IF as a two port linear amplifier is useful to implement
maximum stable power gain, input matching, and stability
over a desired bandpass response and to ensure stable
operation outside the bandpass as well. The MC13155 is
unconditionally stable over most of its useful operating
frequency range; however, it can be made unconditionally
stable over its entire operating range with the proper
decoupling of Pins 2 and 15. Relatively small decoupling
capacitors of about 100 pF have a significant effect on the
wideband response and stability. This is shown in the
scattering parameter tables where S–parameters are shown
for various values of C2 and C15 and at VEE of – 3.0 and
– 5.0 Vdc.

MOTOROLA ANALOG IC DEVICE DATA

3

TYPICAL PERFORMANCE AT TEMPERATURE

Figure 3. Drain Current versus Supply Voltage

10

TA = 25°C

8.0

6.0

4.0

, DRAIN CURRENT (mAdc)

Total

2.0

and I

14

I

0.0

0.0

1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 100 1000

I

= I14 + I

Total

VEE, SUPPLY VOLTAGE (–Vdc)

11

I

14

MC13155

(See Figure 2. T est Circuit)

Figure 4. RSSI Output versus Frequency and

100

80

µ

60

40

RSSI OUTPUT ( A)

12

I ,

20

0

10

Input Signal Level

VEE = – 5.0Vdc

0 dBm

–10 dBm

– 20 dBm

– 30 dBm

– 40 dBm

f, FREQUENCY (MHz)

Figure 5. T otal Drain Current versus Ambient

T emperature and Supply Voltage

8.5

8.0

7.5

7.0

6.5

TOTAL DRAIN CURRENT (mAdc)

6.0

14

5.5

and I ,

11

5.0

I

–50 – 30 –10 10 30 50 70 90 110 –50 – 30 –10 10 30 50 70 90 110

TA, AMBIENT TEMPERATURE (°C)

VEE = – 6.0 Vdc

– 3.0 Vdc

– 5.0 Vdc

Figure 7. RSSI Output versus Ambient

T emperature and Supply Voltage

µ

RSSI OUTPUT ( A)

12

I ,

25.0

24.5

24.0

23.5

23.0

22.5

22.0

VEE = – 6.0 Vdc

VEE = – 5.0 Vdc

VEE = – 3.0 Vdc

Figure 6. Detector Drain Current and Limiter

Drain Current versus Ambient Temperature

5.59.0
f = 70 MHz

5.0

VEE = – 5.0 Vdc

4.5

4.0

3.5

DRAIN CURRENT (mAdc)

3.0

11

2.5

14

I and I ,

2.0

TA, AMBIENT TEMPERATURE (

Figure 8. RSSI Output versus Input Signal

V oltage (Vin at Temperature)

100

TA = + 85°C

µ

RSSI OUTPUT ( A)

12

I ,

80

60

40

20

I

14

I

11

°

C)

+25°C

–40°C

21.5

4

0

– 30 –10 10 30 50 70 90 110 1.0 10 100 1000

–50

0.1
Vin, INPUT VOLTAGE (mVrms)TA, AMBIENT TEMPERATURE (°C)

MOTOROLA ANALOG IC DEVICE DATA

MC13155

Figure 9. Differential Detector Output
V oltage versus Ambient Temperature

and Supply V oltage

750 220
700
650
600

pp

550
500

(Pins 4, 5), (mV )

450
400

DIFFERENTIAL DETECTOR OUTPUT VOLTAGE

350

–50 – 30 –10 10 30 50 70 90 110

VEE = – 6.0 Vdc

– 5.0 Vdc

– 3.0 Vdc

Figure 11A. Differential Detector Output Voltage

versus Q of Quadrature LC Tank

)

1600

Vin = – 30 dBm

pp

VEE = – 5.0 Vdc

1400

fc = 70 MHz
f

1200
1000

800
600
400
200

DIFFERENTIAL DETECTOR OUTPUT (mV

= 1.0 MHz

mod

(Figure 16 no external capacitors
between Pins 7, 8 and 9, 10)

0

1.5

2.5 3.5 4.5 5.5

2.0 3.0 4.0 5.0 6.0 1.5 2.5 3.5 4.5 5.52.0 3.0 4.0 5.0 6.0
Q OF QUADRATURE LC TANK

f

= ±6.0 MHz

dev

±

5.0 MHz

±

4.0 MHz

±

3.0 MHz

±

2.0 MHz

±

1.0 MHz

Figure 10. Differential Limiter Output Voltage

versus Ambient T emperature

(Vin = 1 and 10 mVrms)

f = 70 MHz
VEE = – 5.0 Vdc

200

180

160

(Pins 7, 10), (mVrms)

140

DIFFERENTIAL LIMITER OUTPUT VOLTAGE

120

–50 – 30 –10 10 30 50 70 90

TA, AMBIENT TEMPERATURE (°C)TA, AMBIENT TEMPERATURE (°C)

Vin = 10 mVrms

Vin = 1.0 mVrms

Figure 11B. Differential Detector Output Voltage

versus Q of Quadrature LC Tank

)

2400

Vin = – 30 dBm

pp

2000

1600

1200

800

400

0

DIFFERENTIAL DETECTOR OUTPUT (mV

VEE = – 5.0 Vdc
fc = 70 MHz
f

= 1.0 MHz

mod

(Figure 16 no external capacitors
between Pins 7, 8 and 9, 10)

Q OF QUADRATURE LC TANK

f

= ±6.0 MHz

dev

±

5.0 MHz

±

4.0 MHz

±

3.0 MHz

±

2.0 MHz

±

1.0 MHz

Figure 11.

Figure 12. RSSI Output V oltage versus IF Input

0

VEE = – 5.0 Vdc
fc = 70 MHz

–1.0

(See Figure 16)

–2.0

–3.0

–4.0

–5.0

RSSI OUTPUT VOLTAGE, (Vdc)

–80 –60 –40 –20 0 20

Capacitively coupled
interstage: no attenuation

15 dB Interstage
Attenuator

IF INPUT, (dBm)

MOTOROLA ANALOG IC DEVICE DATA

Figure 13. – S+N, N versus IF Input

10

0

–10
–20
–30

S+N, N (dB)

–40

fc = 70 MHz

–50

f

= 1.0 MHz

mod

±

5.0 MHz

f

=

dev

–60

VEE = – 5.0 Vdc

–70

–90 – 70 – 50 – 30 –10 10

IF INPUT (dBm)

S+N

N

5

MC13155

In the S–parameters measurements, the IF is treated as a
two–port linear class A amplifier. The IF amplifier is
measured with a single–ended input and output configuration
in which the Pins 16 and 7 are terminated in the series
combination of a 47 Ω resistor and a 10 nF capacitor to V

CC

ground (see Figure 14. S–Parameter Test Circuit).

The S–parameters are in polar form as the magnitude
(MAG) and angle (ANG). Also listed in the tables are the
calculated values for the stability factor (K) and the Maximum

Figure 14. S–Parameter T est Circuit

IF

Input

SMA

1.0n

C2

1

2

3

4

5

IN1

DEC1

VCC1

DETO1

DETO2

Available Gain (MAG). These terms are related in the
following equations:

K = (1– IS11 I2 – I S22 I2 + I ∆ I2 ) / ( 2 I S12 S21 I )

where: I ∆ I = I S11 S22 – S12 S21 I.

MAG = 10 log I S21 I / I S12 I + 10 log I K – ( K2 – 1)

1/2

I

where: K > 1. The necessary and sufficient conditions for
unconditional stability are given as K > 1:

B1 = 1 + I S11 I2 – I S22 I2 – I ∆ I2 > 0

IN2

DEC2

VEE1

RSSI

Buffer

RSSI

1.0n

16

C15

15

14

13

12

47

V

EE

100n1.0n

10

µ

+

47

1.0n

6

7

8

VCC2

LIMO1

VEE2

LIMO2

QUAD2QUAD1

11

10

SMA

1.0n

9

IF
Output

6

MOTOROLA ANALOG IC DEVICE DATA

MC13155

S–Parameters (V

Frequency Input S1 1 Forward S21 Rev S12 Output S22 K MAG

MHz MAG ANG MAG ANG MAG ANG MAG ANG MAG dB

1.0 0.94 –13 8.2 143 0.001 7.0 0.87 –22 2.2 32

2.0 0.78 –23 23.5 109 0.001 –40 0.64 –31 4.2 33.5

5.0 0.48 1.0 39.2 51 0.001 –97 0.34 –17 8.7 33.7

7.0 0.59 15 40.3 34 0.001 –41 0.33 –13 10.6 34.6
10 0.75 17 40.9 19 0.001 –82 0.41 –1.0 5.7 36.7
20 0.95 7.0 42.9 – 6.0 0.001 –42 0.45 0 1.05 46.4
50 0.98 –10 42.2 –48 0.001 – 9.0 0.52 – 3.0 0.29 –
70 0.95 –16 39.8 –68 0.001 112 0.54 –16 1.05 46.4

100 0.93 –23 44.2 –93 0.001 80 0.53 –22 0.76 –
150 0.91 –34 39.5 –139 0.001 106 0.50 –34 0.94 –
200 0.87 –47 34.9 –179 0.002 77 0.42 –44 0.97 –
500 0.89 –103 11.1 –58 0.022 57 0.40 –117 0.75 –
700 0.61 –156 3.5 –164 0.03 0 0.52 179 2.6 13.7
900 0.56 162 1.2 92 0.048 –44 0.47 112 4.7 4.5

1000 0.54 131 0.8 42 0.072 –48 0.44 76 5.1 0.4

S–Parameters (V

Frequency Input S1 1 Forward S21 Rev S12 Output S22 K MAG

MHz MAG ANG MAG ANG MAG ANG MAG ANG MAG dB

1.0 0.98 –15 11.7 174 0.001 –14 0.84 –27 1.2 37.4

2.0 0.50 – 2.0 39.2 85.5 0.001 –108 0.62 –35 6.0 35.5

5.0 0.87 8.0 39.9 19 0.001 100 0.47 – 9.0 4.2 39.2

7.0 0.90 5.0 40.4 9.0 0.001 –40 0.45 – 8.0 3.1 40.3
10 0.92 3.0 41 1.0 0.001 –40 0.44 – 5.0 2.4 41.8
20 0.92 – 2.0 42.4 –14 0.001 –87 0.49 – 6.0 2.4 41.9
50 0.91 – 8.0 41.2 –45 0.001 85 0.50 – 5.0 2.3 42
70 0.91 –11 39.1 –63 0.001 76 0.52 – 4.0 2.2 41.6

100 0.91 –15 43.4 –84 0.001 85 0.50 –11 1.3 43.6
150 0.90 –22 38.2 –126 0.001 96 0.43 –22 1.4 41.8
200 0.86 –33 35.5 –160 0.002 78 0.43 –21 1.3 39.4
500 0.80 –66 8.3 – 9.0 0.012 75 0.57 –63 1.7 23.5
700 0.62 –96 2.9 –95 0.013 50 0.49 –111 6.3 12.5
900 0.56 –120 1.0 –171 0.020 53 0.44 –150 13.3 2.8

1000 0.54 –136 0.69 154 0.034 65 0.44 –179 12.5 – 0.8

= – 5.0 Vdc, TA = 25°C, C2 and C15 = 0 pF)

EE

= – 5.0 Vdc, TA = 25°C, C2 and C15 = 100 pF)

EE

MOTOROLA ANALOG IC DEVICE DATA

7

MC13155

S–Parameters (V

Frequency Input S1 1 Forward S21 Rev S12 Output S22 K MAG

MHz MAG ANG MAG ANG MAG ANG MAG ANG MAG dB

1.0 0.74 4.0 53.6 110 0.001 101 0.97 –35 0.58 –

2.0 0.90 3.0 70.8 55 0.001 60 0.68 –34 1.4 45.6

5.0 0.91 0 87.1 21 0.001 –121 0.33 –60 1.1 49

7.0 0.91 0 90.3 11 0.001 –18 0.25 –67 1.2 48.4
10 0.91 – 2.0 92.4 2.0 0.001 33 0.14 –67 1.5 47.5
20 0.91 – 4.0 95.5 –16 0.001 63 0.12 –15 1.3 48.2
50 0.90 – 8.0 89.7 –50 0.001 –43 0.24 26 1.8 46.5
70 0.90 –10 82.6 –70 0.001 92 0.33 21 1.4 47.4

100 0.91 –14 77.12 –93 0.001 23 0.42 –1.0 1.05 49
150 0.94 –20 62.0 –122 0.001 96 0.42 –22 0.54 –
200 0.95 –33 56.9 –148 0.003 146 0.33 –62 0.75 –
500 0.82 –63 12.3 –12 0.007 79 0.44 –67 1.8 26.9
700 0.66 –98 3.8 –107 0.014 84 0.40 –115 4.8 14.6
900 0.56 –122 1.3 177 0.028 78 0.39 –166 8.0 4.7

1000 0.54 –139 0.87 141 0.048 76 0.41 165 7.4 0.96

S–Parameters (V

Frequency Input S1 1 Forward S21 Rev S12 Output S22 K MAG

MHz MAG ANG MAG ANG MAG ANG MAG ANG MAG dB

1.0 0.89 –14 9.3 136 0.001 2.0 0.84 –27 3.2 30.7

2.0 0.76 –22 24.2 105 0.001 –90 0.67 –37 3.5 34.3

5.0 0.52 5.0 35.7 46 0.001 –32 0.40 –13 10.6 33.3

7.0 0.59 12 38.1 34 0.001 –41 0.40 –10 9.1 34.6
10 0.78 15 37.2 16 0.001 –92 0.40 –1.0 5.7 36.3
20 0.95 5.0 38.2 – 9.0 0.001 47 0.51 – 4.0 0.94 –
50 0.96 –11 39.1 –50 0.001 –103 0.48 – 6.0 1.4 43.7
70 0.93 –17 36.8 –71 0.001 –76 0.52 –13 2.2 41.4

100 0.91 –25 34.7 –99 0.001 –152 0.51 –19 3.0 39.0
150 0.86 –37 33.8 –143 0.001 53 0.49 –34 1.7 39.1
200 0.81 –49 27.8 86 0.003 76 0.55 –56 2.4 35.1
500 0.70 –93 6.2 –41 0.015 93 0.40 –110 2.4 19.5
700 0.62 –144 1.9 –133 0.049 56 0.40 –150 3.0 8.25
900 0.39 –176 0.72 125 0.1 1 –18 0.25 163 5.1 –1.9

1000 0.44 166 0.49 80 0.10 –52 0.33 127 7.5 – 4.8

= – 5.0 Vdc, TA = 25°C, C2 and C15 = 680 pF)

EE

= – 3.0 Vdc, TA = 25°C, C2 and C15 = 0 pF)

EE

8

MOTOROLA ANALOG IC DEVICE DATA

MC13155

S–Parameters (V

Frequency Input S1 1 Forward S21 Rev S12 Output S22 K MAG

MHz MAG ANG MAG ANG MAG ANG MAG ANG MAG dB

1.0 0.97 –15 11.7 171 0.001 – 4.0 0.84 –27 1.4 36.8

2.0 0.53 2.0 37.1 80 0.001 –91 0.57 –31 6.0 34.8

5.0 0.88 7.0 37.7 18 0.001 – 9.0 0.48 – 7.0 3.4 39.7

7.0 0.90 5.0 37.7 8.0 0.001 –11 0.49 – 7.0 2.3 41
10 0.92 2.0 38.3 1.0 0.001 –59 0.51 – 9.0 2.0 41.8
20 0.92 – 2.0 39.6 –15 0.001 29 0.48 – 3.0 1.9 42.5
50 0.91 – 8.0 38.5 –46 0.001 –21 0.51 – 7.0 2.3 41.4
70 0.91 –11 36.1 –64 0.001 49 0.50 – 8.0 2.3 40.8

100 0.91 –15 39.6 –85 0.001 114 0.52 –13 1.7 37.8
150 0.89 –22 34.4 –128 0.001 120 0.48 –23 1.6 40.1
200 0.86 –33 32 –163 0.002 86 0.40 –26 1.7 37.8
500 0.78 –64 7.6 –12 0.013 94 0.46 –71 1.9 22.1
700 0.64 –98 2.3 –102 0.027 58 0.42 –109 4.1 10.1
900 0.54 –122 0.78 179 0.040 38.6 0.35 –147 10.0 – 0.14

1000 0.53 –136 0.47 144 0.043 23 0.38 –171 15.4 – 4.52

S–Parameters (V

Frequency Input S1 1 Forward S21 Rev S12 Output S22 K MAG

MHz MAG ANG MAG ANG MAG ANG MAG ANG MAG dB

1.0 0.81 3.0 37 101 0.001 –19 0.90 –32 1.1 43.5

2.0 0.90 2.0 47.8 52.7 0.001 –82 0.66 –39 0.72 –

5.0 0.91 0 58.9 20 0.001 104 0.37 –56 2.3 44

7.0 0.90 –1 60.3 11 0.001 –76 0.26 –55 2.04 44
10 0.91 – 2.0 61.8 3.0 0.001 105 0.18 –52 2.2 43.9
20 0.91 – 4.0 63.8 –15 0.001 59 0.11 –13 2.0 44.1
50 0.90 – 8.0 60.0 –48 0.001 96 0.22 33 2.3 43.7
70 0.90 –11 56.5 –67 0.001 113 0.29 15 2.3 43.2

100 0.91 –14 52.7 –91 0.001 177 0.36 5.0 2.0 43
150 0.93 –21 44.5 –126 0.001 155 0.35 –17 1.8 42.7
200 0.90 –43 41.2 –162 0.003 144 0.17 –31 1.6 34.1
500 0.79 –65 7.3 –13 0.008 80 0.44 –75 3.0 22
700 0.65 –97 2.3 –107 0.016 86 0.38 –124 7.1 10.2
900 0.56 –122 0.80 174 0.031 73 0.38 –174 12 0.37

1000 0.55 –139 0.52 137 0.50 71 0.41 157 11.3 – 3.4

= – 3.0 Vdc, TA = 25°C, C2 and C15 = 100 pF)

EE

= – 3.0 Vdc, TA = 25°C, C2 and C15 = 680 pF)

EE

MOTOROLA ANALOG IC DEVICE DATA

9

MC13155

DC Biasing Considerations

The DC biasing scheme utilizes two VCC connections
(Pins 3 and 6) and two VEE connections (Pins 14 and 11).
VEE1 (Pin 14) is connected internally to the IF and RSSI
circuits’ negative supply bus while VEE2 (Pin 1 1) is connected
internally to the quadrature detector’s negative bus. Under
positive ground operation, this unique configuration offers the
ability to bias the RSSI and IF separately from the quadrature
detector. When two ICs are cascaded as shown in the 70
MHz application circuit and provided by the PCB (see
Figures 17 and 18), the first MC13155 is used without biasing
its quadrature detector, thereby saving approximately 3.0
mA. A total current of 7.0 mA is used to fully bias each IC,
thus the total current in the application circuit is
approximately 1 1 mA. Both VCC pins are biased by the same
supply. VCC1 (Pin 3) is connected internally to the positive
bus of the first half of the IF limiting amplifier, while VCC2 is
internally connected to the positive bus of the RSSI, the
quadrature detector circuit, and the second half of the IF
limiting amplifier (see Figure 15). This distribution of the V
enhances the stability of the IC.

RSSI Circuitry

The RSSI circuitry provides typically 35 dB of linear
dynamic range and its output voltage swing is adjusted by

CC

selection of the resistor from Pin 12 to VEE. The RSSI slope
is typically 2.1 µA/dB ; thus, for a dynamic range of 35 dB, the
current output is approximately 74 µA. A 47 k resistor will
yield an RSSI output voltage swing of 3.5 Vdc. The RSSI
buffer output at Pin 13 is an emitter–follower and needs an
external emitter resistor of 10 k to VEE.

In a cascaded configuration (see circuit application in
Figure 16), only one of the RSSI Buffer outputs (Pin 13) is
used; the RSSI outputs (Pin 12 of each IC) are tied together
and the one closest to the VEE supply trace is decoupled to
VCC ground. The two pins are connected to VEE through a 47
k resistor. This resistor sources a RSSI current which is
proportional to the signal level at the IF input; typically,

1.0 mVrms (– 47 dBm) is required to place the MC13155 into
limiting. The measured RSSI output voltage response of the
application circuit is shown in Figure 12. Since the RSSI
current output is dependent upon the input signal level at the
IF input, a careful accounting of filter losses, matching and
other losses and gains must be made in the entire receiver
system. In the block diagram of the application circuit shown
below, an accounting of the signal levels at points throughout
the system shows how the RSSI response in Figure 12 is
justified.

Block Diagram of 70 MHz Video Receiver Application Circuit

Input – 45 dBm – 70 dBm – 72 dBm – 32 dBm – 47 dBm Minimum Input to Acquire
Level: 1.26 mVrms 71

IF

Input

Saw

Filter

– 25 dB

(Insertion Loss)

µ

Vrms 57 µVrms 57 µVrms 1.0 mVrms Limiting in MC13155

16

1:4

Transformer

2.0 dB

(Insertion Loss)

1

Cascading Stages

The limiting IF output is pinned–out differentially,
cascading is easily achieved by AC coupling stage to stage.
In the evaluation PCB, AC coupling is shown, however,
interstage filtering may be desirable in some applications. In
which case, the S–parameters provide a means to implement
a low loss interstage match and better receiver sensitivity .

Where a linear response of the RSSI output is desired
when cascading the ICs, it is necessary to provide at least
10 dB of interstage loss. Figure 12 shows the RSSI response
with and without interstage loss. A 15 dB resistive attenuator
is an inexpensive way to linearize the RSSI response. This
has its drawbacks since it is a wideband noise source that is
dependent upon the source and load impedance and the
amount of attenuation that it provides. A better, although
more costly, solution would be a bandpass filter designed to
the desired center frequency and bandpass response while
carefully selecting the insertion loss. A network topology

10

MC13155

7

40 dB Gain

(Attenuator)

16

MC13155

1

40 dB Gain–15 dB

shown below may be used to provide a bandpass response
with the desired insertion loss.

Network Topology

1.0n

10

0.22

µ

7

1.0n

16

1

10

MOTOROLA ANALOG IC DEVICE DATA

MC13155

Quadrature Detector

The quadrature detector is coupled to the IF with internal

2.0 pF capacitors between Pins 7 and 8 and Pins 9 and 10.
For wideband data applications, such as FM video and
satellite receivers, the drive to the detector can be increased
with additional external capacitors between these pins, thus,
the recovered video signal level output is increased for a
given bandwidth (see Figure 1 1A and Figure 11B).

The wideband performance of the detector is controlled by
the loaded Q of the LC tank circuit. The following equation
defines the components which set the detector circuit’s
bandwidth:

Q = RT/X

where: RT is the equivalent shunt resistance across the LC
T ank and XL is the reactance of the quadrature inductor at the
IF frequency (XL = 2πfL).

The inductor and capacitor are chosen to form a resonant
LC T ank with the PCB and parasitic device capacitance at the
desired IF center frequency as predicted by:

fc = (2π √(LCp))

where: L is the parallel tank inductor and Cp is the equivalent
parallel capacitance of the parallel resonant tank circuit.

The following is a design example for a wideband detector
at 70 MHz and a loaded Q of 5. The loaded Q of the
quadrature detector is chosen somewhat less than the Q of
the IF bandpass. For an IF frequency of 70 MHz and an
IF bandpass of 10.9 MHz, the IF bandpass Q is
approximately 6.4.

Example:

Let the external Cext = 20 pF. (The minimum value here
should be greater than 15 pF making it greater than the
internal device and PCB parasitic capacitance, Cint ≈

3.0 pF).

Cp = Cint + Cext = 23 pF

Rewrite Equation 2 and solve for L:

L = (0.159)2 /(Cp fc2)

L = 198 nH, thus, a standard value is chosen.

L = 0.22 µH (tunable shielded inductor).

L

–1

(1)

(2)

The value of the total damping resistor to obtain the
required loaded Q of 5 can be calculated by rearranging
Equation 1:

RT = Q(2πfL)
RT = 5 (2π)(70)(0.22) = 483.8 Ω.

The internal resistance, Rint between the quadrature tank
Pins 8 and 9 is approximately 3200 Ω and is considered in
determining the external resistance, Rext which is calculated
from:

Rext = ((RT)(Rint))/ (Rint – RT)
Rext = 570, thus, choose the standard value.
Rext = 560 Ω.

SAW Filter

In wideband video data applications, the IF occupied
bandwidth may be several MHz wide. A good rule of thumb is
to choose the IF frequency about 10 or more times greater
than the IF occupied bandwidth. The IF bandpass filter is a
SAW filter in video data applications where a very selective
response is needed (i.e., very sharp bandpass response).
The evaluation PCB is laid out to accommodate two SAW
filter package types: 1) A five–leaded plastic SIP package.
Recommended part numbers are Siemens X6950M which
operates at 70 MHz; 10.4 MHz 3 dB passband, X6951M
(X252.8) which operates at 70 MHz; 9.2 MHz 3 dB passband;
and X6958M which operates at 70 MHz, 6.3 MHz 3 dB
passband, and 2) A four–leaded TO–39 metal can package.
Typical insertion loss in a wide bandpass SA W filter is 25 dB.

The above SAW filters require source and load
impedances of 50 Ω to assure stable operation. On the PC
board layout, space is provided to add a matching network,
such as a 1:4 surface mount transformer between the SAW
filter output and the input to the MC13155. A 1:4 transformer,
made by Coilcraft and Mini Circuits, provides a suitable
interface (see Figures 16, 17 and 18). In the circuit and
layout, the SAW filter and the MC13155 are differentially
configured with interconnect traces which are equal in length
and symmetrical. This balanced feed enhances RF stability,
phase linearity , and noise performance.

MOTOROLA ANALOG IC DEVICE DATA

11

2

CC

V

LIM Out

MC13155

Det

5

1.0p

Out

Figure 15.

4

2V

1114116

EE

V

Quad Coil

1.6k 1.6k

2.0p 2.0p

LIM Out

Figure 15. Simplified Internal Circuit Schematic

1

CC

V

8.0k

8.0k

1

EE

Bias Bias

12

Decouple

15 2 13 12 3 10 9 8 7 6

RSSIRSSI

Buffer

InputInput

10p

1.0k 1.0k

MOTOROLA ANALOG IC DEVICE DATA

If Input

1

2

3

SAW Filter is Siemens

Part Number X6950M

SAW Filter

MC13155

Figure 16. 70 MHz Video Receiver Application Circuit

1:4

5

4

220

1.0n1.0n

100p

1

2

3

4

5

6

7

IN1

DEC1

VCC1

DETO1

DETO2

VCC2

LIMO1

MC13155

DEC2

Buffer

LIMO2

IN2

VEE1

RSSI

RSSI

VEE2

16

15

14

13

12

11

10

100p

10n

Output

10n

1.0n

RSSI

47k

10k

100n

Detector

Output

100n

100n

33p

33p

1.0k

1.0k

820

100p

2.0p

8

1

2

3

4

5

6

7

8

QUAD1

MC13155

IN1

DEC1

VCC1

DETO1

DETO2

VCC2

LIMO1

QUAD1

820

820

560

QUAD2

IN2

DEC2

VEE1

RSSI

Buffer

RSSI

VEE2

LIMO2

QUAD2

16

15

14

13

12

11

10

9

+

820

1.0n1.0n

100p

10n

10

10n

2.0p

9

µ

+

10

µ

VEE2

VEE1

MOTOROLA ANALOG IC DEVICE DATA

20p

0.22

L

L– Coilcraft part number 146–08J08S

µ

13

MC13155

Figure 17. Component Placement (Circuit Side)

Figure 18. Component Placement (Ground Side)

14

MOTOROLA ANALOG IC DEVICE DATA

MC13155

Figure 19. Circuit Side View

4.0

″

4.0

″

Figure 20. Ground Side View

MOTOROLA ANALOG IC DEVICE DATA

15

SEATING

PLANE

1

G

–T

–

D

0.25 (0.010) T B A

16 PL

M

–A

–

S S

MC13155

OUTLINE DIMENSIONS

D SUFFIX

PLASTIC PACKAGE

CASE 751B

(SO–16)

NOTES:

1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.

2. CONTROLLING DIMENSION: MILLIMETER.

3. DIMENSION A AND B DO NOT INCLUDE MOLD

916

P

8 PL

0.25 (0.010)

–B

–

8

M M

B

X 45°

R

C

K

M

F

J

PROTRUSION.

4. MAXIMUM MOLD PROTRUSION 0.15 (0.006)
PER SIDE.

5. 751B–03 IS OBSOLETE, NEW STANDARD
751B–04.

MILLIMETERS INCHES

MIN MINMAX MAX

DIM

A

9.80

B

3.80

C

1.35

D

0.35

F

0.40

1.27 BSC 0.050 BSC

G
J

0.19

K

0.10

M

°

0

P

5.80

R

0.25

10.00

4.00

1.75

0.49

1.25

0.25

0.25
7

6.20

0.50

0.386

0.393

0.150

0.157

0.054

0.068

0.014

0.019

0.016

0.049

0.008

0.009

0.004

0.009

°

°

0

0.229

0.010

7

0.244

0.019

°

Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty, representation or guarantee regarding
the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit, and
specifically disclaims any and all liability, including without limitation consequential or incidental damages. “T ypical” parameters which may be provided in Motorola
data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals”
must be validated for each customer application by customer’s technical experts. Motorola does not convey any license under its patent rights nor the rights of
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16

◊

MOTOROLA ANALOG IC DEVICE DATA

MC13155/D