MITEL MT8812AP, MT8812AC, MT8812AE, SP5659MP1T Datasheet

The SP5659 is a single chip frequency synthesiser designed

for tuning systems up to 2·7GHz.

The RF preamplifier drives a divide-by two prescaler which can be disabled for applications up to 2GHz, allowing direct interfacing with the programmable divider, resulting in a step size equal to the comparison frequency. For applications up to 2·7GHz the divide-by two is enabled to give a step size of twice the comparison frequency.

The comparison frequency is obtained either from an onchip crystal controlled oscillator or from an external source. The oscillator frequency F

REF

or the comparison frequency

COMP

may be switched to the REF/COMP output; this feature is ideally suited to providing the reference frequency for a second synthesiser such as in a double conversion tuner (see Fig. 5).

The synthesiser is controlled via an I

C bus and responds to one of four programmable addresses which are selected by applying a specific voltage to the Address input. This feature enables two or more synthesisers to be used in a system.

The SP5659 contains four switching ports, P0-P3 and a

5-level ADC, the output of which can be read via the I

C bus.

The SP5659 also contains a varactor line disable and

charge pump disable facility.

FEATURES

■ Complete 2·7GHz Single Chip System

■ Optimised for Low Phase Noise

■ Selectable 42 prescaler

■ Selectable Reference Division Ratio

■

Selectable Reference/Comparison Frequency Output

■ Selectable Charge Pump Current

■ Varactor Drive Amplifier Disable

■ 5-Level ADC

■ Variable I

C BUS Address for Multi-tuner Applications

SP5659

2·7GHz I2C Bus Low Phase Noise Synthesiser

Preliminary Information

Supersedes March 1996 version, DS4206-1.8 DS4296 - 2.0 June 1998

SP5659

1 2 3 4 5 6 7 8

MP16

16 15 14 13 12 11 10

CHARGE PUMP

CRYSTAL

REF/COMP

ADDRESS

SDA

SCL PORT P3 PORT P2

DRIVE V

RF INPUT RF INPUT V

ADC PORT P0 PORT P1

Fig. 1 Pin connections – top view

■ ESD Protection: 4kV, Mil-Std-883C, Method 3015

(1)

■ Pin Compatible with SP5658

(1) Normal ESD handling precautions should be observed.

APPLICATIONS

■ Satellite TV

■ High IF Cable Tuning Systems

THERMAL DATA

= 41°C/W

= 111°C/W

ORDERING INFORMATION

SP5659 KG/MP1S (Tubes) SP5659 KG/MP1T (Tape and reel)

SP5659

ELECTRICAL CHARACTERISTICS

AMB

= 220°C to 180°C, V

= 14·5V to 15·5V, reference frequency = 4MHz. These Characteristics are guaranteed by either production test or design. They apply within the specified ambient temperature and supply voltage ranges unless otherwise stated.

Supply current, I

RF input voltage

RF input impedance RF input capacitance

SDA, SCL

Input high voltage Input low voltage Input high current Input low current Leakage current Input hysteresis

SDA

Output voltage

Charge Pump

Output current Output leakage current Drive output current Drive saturation voltage

External reference input frequency External reference input amplitude Crystal frequency Crystal oscillator drive level Recommended crystal series resistance Crystal oscillator negative resistance

REF/COMP output voltage, enabled

Comparison frequency Equivalent phase noise at phase detector

RF division ratio

Reference division ratio

P0, P1, P2, P3 sink current P0, P1, P2, P3 leakage current

ADC input voltage ADC input current

Address input current high Address input current low

Typ.

Value

13,14

13,14 13,14

5, 6 5, 6 5, 6 5, 6 5, 6 5, 6

1 16 16

7,8,9,10

11 11

3 0

200

4 35 10

400

240 480

68 58

0·8

350

2142

85 73

300

5·5 1·5

210

0·4

610

350 200

500

200

131071 262142

610

20·5

Min. Max.

mA mA

mVrms

Ω

V V

µA µA µA

nA mA mV

MHz

mVp-p

MHz

mVp-p

Ω Ω

mVp-p

MHz

dBC/Hz

µA

mA mA

= 5V, PE = 1 (note 1)

= 5V, PE = 0

300MHz to 2·7GHz, PE = 1 (prescaler enabled) see Fig. 4b 100MHz, PE = 1 (prescaler enabled) see Fig. 4b 100MHz to 2·0GHz, PE = 0 (prescaler disabled) see Fig. 4b

See Fig. 10 See Fig. 10

Input voltage = V

VCC = V

Sink current = 3mA

Drive output disabled

AC coupled sinewave AC coupled sinewave

Parallel resonant crystal (note 2) Includes temperature and process tolerances

AC coupled, RE = 1, see note 3

See note 4

Prescaler disabled, see Table 1 Prescaler enabled, see Table 1 See Table 1

PORT

= 0·7V

PORT

= 13·2V

See Fig. 3 Table 5 V

CC >VINPUT >VEE

Input voltage = V

Characteristic Pin Units Conditions

NOTES

1. Maximum power consumption is 468mW with V

= 5·5V and all ports off.

2. Resistance specified is maximum under all conditions including start up.

3. If the REF/COMP output is not used, it should be left open circuit or connected to V

and disabled by setting RE to logic 0.

4. 6kHz loop bandwidth, phase comparator frequency 250kHZ. Figure measured at 1kHz offset DSB (within loop bandwidth).

SP5659

Supply voltage

RF input voltage

RF input DC offset

Port voltage

Total port current

ADC input DC offset

REF/COMP output DC offset

Charge pump DC offset

Drive DC offset

Crystal oscillator DC offset

Address DC offset

SDA, SCL input voltage

Storage temperature

Junction temperature

Port in off state

Port in on state

13,14

13, 14

7-10

5, 6

ABSOLUTE MAXIMUM RATINGS

All voltages are referred to VEE at 0V

Max.Min.

2·5

10·3

VCC10·3

10·3

VCC10·3

10·3

1150

Value

20·3

255

V p-p

°C °C

Fig. 2 Block diagram

RF IN

ADDRESS

SDA

LOCK

DET

42/1

4 5

COMP

CHARGE PUMP

CRYSTAL

OSC

789

P3 P2 P1 P0

416/17

4-BIT

COUNT

13-BIT

COUNT

PROGRAMMABLE DIVIDER

PREAMP

17-BIT LATCH DIVIDE RATIO

1-BIT

COUNT

PHASE

COMP

I2C

TRANSCEIVER

SCL

CHARGE

PUMP

2-BIT

LATCH

FPD/2

3-BIT ADC

ADC

POWER ON

DETECT

4-BIT LATCH

AND

PORT INTERFACE

REFERENCE

DIVIDER

(SEE TABLE 1)

REF/COMP

2-BIT

LATCH

C1, C0

REF

5-BIT LATCH AND

MODE CONTROL LOGIC

(SEE TABLE 6)

DISABLE

DRIVE

MODE

CONTROL

P0 TEST

CONTROL

Parameter Pin Units Conditions

SP5659

FUNCTIONAL DESCRIPTION

The SP5659 contains all the elements necessary – with the exception of a frequency reference, loop filter and external high voltage transistor – to control a varactor tuned local oscillator, so forming a complete PLL frequency synthesised source. The device allows for operation with a high comparison frequency and is fabricated in high speed logic which enables the generation of a loop with good phase noise performance. The block diagram is shown in Fig. 2.

The RF input signal is fed to an internal preamplifier, which provides gain and reverse isolation from the divider signals. The output of the preamplifier interfaces with a 17-bit fully programmable divider via a 42 prescaler. For applications up to 2·0GHz RF input, the prescaler can be disabled, so eliminating the degradation in phase noise due to prescaler action. The divider is of MN1A architecture, where N = 16 or 17, the M counter is 13 bits and the A counter is 4 bits.

The output of the programmable divider, F

, is fed to the phase comparator where it is compared in phase and frequency domains with the comparison frequency F

COMP

. This frequency is derived either from the on-chip crystal controlled oscillator or from an external reference source. In either case, the reference frequency F

REF

is divided down to the comparison frequency by the reference divider, which is programmable to one of 15 ratios as detailed in Table 1.

The output of the phase detector feeds a charge pump and loop amplifier section which, when used with an external high voltage transistor and loop filter, integrates the current pulses into the varactor line voltage. By invoking the device test modes as described in Fig. 3, Table 6, the varactor drive output can be disabled, so switching the external transistor off. This allows an external voltage to be applied to the varactor line for tuner alignment purposes. Similarly, the charge can also be disabled to a high impedance state.

The programmable divider output F

/2 can be switched to port P0 by programming the device into test mode as set out in Table 6.

PROGRAMMING

The SP5659 is controlled by an I2C Bus. Data and Clock are fed in on the SDA and SCL lines respectively, as defined by the I

C Bus format. The synthesiser can either accept new data (write mode) or send data (read mode). The LSB of the address byte (R/W) sets the device into write mode if it is low and read mode if it is high. Tables 1 and 2 in Fig. 3 illustrate the format of the data. The device can be programmed to respond to several addresses, which enables the use of more than one synthesiser in an I

C Bus system. Table 4 in Fig. 3 shows how the address is selected by applying a voltage to the address input.

When the device receives a valid address byte, it pulls the SDA line low during the acknowledge period, and during following acknowledge periods after further data bytes are programmed. When the device is programmed into the read mode, the controller accepting the data must pull the SDA line low during all status byte acknowledge periods to read another status byte. If the controller fails to pull the SDA line low during this period, the device generates an internal STOP condition, which inhibits further reading.

WRITE Mode (Frequency Synthesis)

With reference to Table 2, bytes 2 and 3 contain frequency information bits 214 to 20 inclusive. Auxiliary frequency bits 2

and 215 are in byte 4. For most frequencies, only bytes 2 and 3 will be required. The remainder of byte 4 and byte 5 control the prescaler enable, reference divider ratio (see Fig. 3), output ports and test modes (see Table 6).

After reception and acknowledgment of a valid address (byte 1), the first bit of the following byte determines whether the byte is interpreted as byte 2 (logic ‘0’) or byte 4 (logic ‘1’);

the next data byte is then interpreted as byte 3 or byte 5, respectively. After two complete data bytes have been received, additional data bytes can be entered, where byte interpretation follows the same procedure without readdressing the device. This procedure continues until a STOP condition is received. The STOP condition can be generated after any data byte; if, however, it occurs during a byte transmission then the previous data is retained. To facilitate smooth fine tuning, the frequency data bytes are only accepted by the device after all 17 bits of the data have been received or after the generation of a STOP condition. Repeatedly sending bytes 2 and 3 only will not change the frequency. A frequency change when one of the following data sequences is sent to an addressed device:

Bytes 2, 3, 4, 5 Bytes 4, 5, 2, 3

or when a STOP condition follows valid data bytes thus:

Bytes 2, 3, 4, STOP Bytes 4, 5, 2, STOP Bytes 2, 3, STOP Bytes 2, STOP Bytes 4, STOP

It should be noted that the SP5569 must be addressed initially with both frequency AND control byte data, since the control byte contains reference divider information which must be provided before a chosen frequency can be synthesised. This implies that after initial turn on, bytes 2, 3 and 4 must be sent followed by a STOP condition as a minimum requirement. Alternatively, bytes 2, 3, 4 and 5 must be sent if port information is also required.

READ Mode

When the device is in read mode the status byte read from the device on the SDA line takes the form shown in Fig. 3, Table 3.

Bit 1 (POR) is the power-on reset indicator and is set to a logic ‘1’ if the V

supply to the device has dropped below 3V

(at 25˚C), for example, when the device is initially turned on.

Comparison frequency

2MHz

1MHz

500kHz

250kHz

125kHz

62·5kHz

31·25kHz

15·625kHz

800kHz

400kHz

200kHz

100kHz

50kHz

25kHz

12·5kHz

Ratio

128

256

Invalid

160

320

Table 1 Reference division ratios (4MHz external reference)

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