Philips TZA3014VH, TZA3014HT, TZA3014U Datasheet

INTEGRATED CIRCUITS

DATA SH EET

TZA3014

2.5 Gbits/s postamplifier with level detector

Product speciﬁcation Supersedes data of 2000 Aug 09 File under Integrated Circuits, IC19

2001 Jun 25

Philips Semiconductors Product speciﬁcation

2.5 Gbits/s postampliﬁer with level detector TZA3014

FEATURES

• Single 3.3 V power supply

• Wideband operation from 50 kHz to 2.5 GHz (typical

value)

• Fully differential

• On-chip DC-offset compensation without external

capacitor

• Interfacing with supplied positive or negative logic

• PositiveEmitterCoupledLogic (PECL)orCurrent-Mode

Logic (CML) compatible data outputs adjustable from 200 to 800 mV (p-p) single-ended

• Power-down capability for unused output or detector

• Rise and fall times of 80 ps (typical value)

• Inverted output possible

• Inputlevel detection circuit forReceived Signal Strength

Indicator (RSSI) and Loss Of Signal (LOS), programmable from 0.4 to 400 mV (p-p) single-ended, with open-drain comparator output for directly interfacing positive or negative logic

• Reference voltage for output level and LOS adjustment

• HTQFP32 and HBCC32 plastic packages with exposed

pad

• Mute input.

APPLICATIONS

• Postamplifier for SDH/SONET transponder

• SDH/SONET wavelength converter

• PECL driver

• Fibre channel arbitrated loop

• Signal level detectors

• Swing converter CML 200 mV (p-p) to

PECL 800 mV (p-p)

• 2.5 GHz clock amplification.

GENERAL DESCRIPTION

The TZA3014 is a low gain postamplifier with a LOS detectorand a RSSIdesigned for use in critical signal path control applications, such as loop-through or Wavelength DivisionMultiplexing (WDM). The signalpath is capable of operating from 50 kHz up to 2.5 GHz.

The TZA3014 canbe delivered in HTQFP32 andHBCC32 packages and as bare die.

ORDERING INFORMATION

TYPE

NUMBER

TZA3014HT HTQFP32 plastic, heatsink thin quad ﬂat package; 32 leads; body 5 × 5 × 1.0 mm SOT547-2 TZA3014VH HBCC32 plastic, heatsink bottom chip carrier; 32 terminals; body 5 × 5 × 0.65 mm SOT560-1 TZA3014U − bare die; 2.22 × 2.22 × 0.28 mm −

NAME DESCRIPTION VERSION

PACKAGE

2001 Jun 25 2

Philips Semiconductors Product speciﬁcation

2.5 Gbits/s postampliﬁer with level detector TZA3014

BLOCK DIAGRAM

handbook, full pagewidth

GNDA

LOSTH

LEVEL

INV

CCA

INQ

CCA

TEST

MUTE

32 (40)

10 (12)

12 (15) 29 (37) 1

3 4

15 (19) 31 (39)

disable LOS output

RSSI

TZA3014

comparator

1×

cross-over

switch

offset compensationoffset compensation

level

buffer

BAND GAP

REFERENCE

5 kΩ

amplifier

(31) 25

(35) 27 (34) 26

(30) 24 (29) 23

(28) 22 (27) 21

(17) 14

MGU122

GNDB

LOS RSSI

CCB

OUT OUTQ V

CCB

ref

The numbers in parentheses refer to the pad numbers of the bare die version.

Fig.1 Block diagram.

2001 Jun 25 3

Philips Semiconductors Product speciﬁcation

2.5 Gbits/s postampliﬁer with level detector TZA3014

PINNING

SYMBOL PIN PAD TYPE

CCA

1 1 S supply voltage for input and LOS detector

(1)

DESCRIPTION

IN 2 2 I differential input; complimentary to pin INQ; DC bias level is set internally

at approximately V

− 0.33 V

INQ 3 3 I differential input; complimentary to pin IN; DC bias level is set internally at

CCA

approximately V

4 4 S supply voltage for input and LOS detector

− 0.33 V

n.c. − 5 − not connected n.c. − 6 − not connected n.c. 5 7 − not connected n.c. 6 8 I not connected n.c. 7 9 I not connected n.c. 8 10 S not connected n.c. 9 11 S not connected LOSTH 10 12 I input for setting threshold level of LOS detector; threshold level is set by

connecting external resistors between pins V

CCA

and V

; when forced to

ref

GNDA or not connected, the LOS detector is switched off n.c. 11 13 I not connected n.c. − 14 − not connected LEVEL 12 15 I input for setting AC level of the output circuit; output signal level is set by

connecting external resistors between pins V

or not connected, pins OUT and OUTQ will be switched off

CCA

and V

; when forced to

ref

n.c. 13 16 I not connected V

ref

14 17 O reference voltage for programming output level circuit and LOS threshold;

typical value is VCC− 1.6 V; no external capacitor allowed n.c. − 18 − not connected TEST 15 19 I for test purposes only; to be left open-circuit in the application n.c. 16 20 S not connected n.c. 17 21 S not connected n.c. 18 22 O not connected n.c. 19 23 O not connected n.c. 20 24 S not connected n.c. − 25 − not connected n.c. − 26 − not connected V

CCB

21 27 S supply voltage for output circuit OUTQ 22 28 O PECL or CML compatible differential output; complimentary to pin OUT OUT 23 29 O PECL or CML compatible differential output; complimentary to pin OUTQ V

CCB

24 30 S supply voltage for output circuit GNDB 25 31 S ground for output circuit n.c. − 32 O not connected n.c. − 33 O-DRN not connected

2001 Jun 25 4

Philips Semiconductors Product speciﬁcation

2.5 Gbits/s postampliﬁer with level detector TZA3014

SYMBOL PIN PAD TYPE

(1)

DESCRIPTION

RSSI 26 34 O RSSI output LOS 27 35 O-DRN output of LOS detector; direct drive to either positive or negative supplied

logic via internal 5 kΩ resistor n.c. 28 36 TTL not connected INV 29 37 TTL input to invert the signal at pins OUT and OUTQ; supports positive or

negative logic n.c. 30 38 TTL not connected MUTE 31 39 TTL input to mute the output signal on pins OUT (‘0’) and OUTQ (‘1’); supports

positive or negative logic GNDA 32 40 S ground for input and LOS detector GNDp pad − S ground pad (exposed die pad)

Note

1. Pin type abbreviations: O = output, I = input, S = power supply, TTL = logic input and O-DRN = open-drain output.

handbook, full pagewidth

GNDA 32

MUTE 31

n.c.

INV 29

n.c. 28

LOS 27

RSSI 26

GNDB 25

CCA

INQ

CCA

n.c. n.c. n.c. n.c.

3 4 5 6 7 8

n.c.

exposed pad

TZA3014HT

n.c.

LOSTH

LEVEL

13 n.c.

GNDp

ref

Fig.2 Pin configuration HTQFP32 package.

TEST

16 n.c.

24 23 22 21 20 19 18 17

MGU123

CCB

OUT OUTQ V

CCB

n.c. n.c. n.c. n.c.

2001 Jun 25 5

Philips Semiconductors Product speciﬁcation

2.5 Gbits/s postampliﬁer with level detector TZA3014

handbook, full pagewidth

GNDA

MUTE

n.c.

INV

n.c.

LOS

RSSI

GNDB

CCA

1 3231302928272625

INQ

2 3

exposed pad

4 n.c. n.c. n.c. n.c.

n.c.

TZA3014VH

10 11 12 13 14 15

n.c.

LOSTH

n.c.

LEVEL

GNDp

ref

TEST

n.c.

Fig.3 Pin configuration HBCC32 package.

24 23 22 21 20 19 18

CCB

OUT OUTQ

CCB

n.c. n.c. n.c.

n.c.

MGU124

2001 Jun 25 6

Philips Semiconductors Product speciﬁcation

2.5 Gbits/s postampliﬁer with level detector TZA3014

FUNCTIONAL DESCRIPTION

The TZA3014 is a postamplifier with a RSSI circuit to provide output signals for RSSI and LOS (see Fig.1). The input signal can be amplified to a programmable level. An active level control circuit ensures this level. The control voltage on pin INV inverts the outputs, so avoiding arequiredcomplicatedPrintedCircuit Board (PCB) layout. An offset compensation circuit minimizes the effect of any voltage offset present at the input.

The RSSI and LOS detector are based on a 7-stage ‘successive detection’ circuit which provides a logarithmic output. The LOS detector is followed bya comparator with aprogrammablethreshold.Theinputsignalleveldetection is implemented to check if the input signal is above the user-programmedlevel. The usercan ensure that datawill only be transmitted when the input signal-to-noise ratio is sufficient for low bit error rate system operation. A second offset compensation circuit minimizes the effect of any voltage offset present in the logarithmic amplifier.

RF input circuit

The input circuit contains internal 50 Ω resistors decoupled to V

via an internal common mode 12 pF

CCA

capacitor (see Fig.4). The inputs IN and INQ are DC-biased at approximately

− 0.33 V by an internal reference generator. The

CCA

TZA3014 can be DC-coupled, but AC coupling is preferred. When DC-coupled, the drive source must operate within the allowable input range (V

− 1.0 V to V

CCA

+ 0.3 V). The DC-offset voltage

CCA

should stay below a few millivolts since the internal DC-offset compensation circuit has a limited correction range. When AC-coupled, do not use capacitors that cause a 3 dB cut-off point at 50 kHz (postamplifier cut-off point) or at 1 MHz (RSSI cut-off point).

RF output circuit

Matching the outputs of the postamplifier (seeFig.5) is not mandatory. In most applications, the receiving end of the transmission line will be properly matched, causing very few reflections.

Matching the transmitting end of the transmission line to absorb reflections only, is recommended for verysensitive applications.

handbook, halfpage

INQ

12 pF

420 Ω

50 Ω50 Ω

CCA

GNDA

MGU125

Fig.4 RF input circuit.

RF output level adjustment

The output level can be made compatible with CML or PECL by adjusting the voltage on pin LEVEL. The DC voltages on pins OUT and OUTQ relate to the DC voltage on pin LEVEL. Due to the effect of the 50 Ω load resistance at the receiving end, for a given peak-to-peak value on pins OUT and OUTQ, a different voltage is required on pin LEVEL in case the output is AC-coupled and when the output is DC-coupled (see Figs 5 and 6).

When pin LEVEL is not connected or connected to V

CCA

the postamplifier is in power-down state (see Fig.5).

DC-offset compensation loop

A DC-offset compensation loop connected between the amplifier output and the buffer input maintains the toggle point at the buffer input when there is no input signal (see Fig.1). This active control circuit is integrated and does not require an external capacitor. The loop time constant determines the lower cut-off frequency of the amplifier chain, and is internally fixed at approximately 5 kHz.

In such cases, 100 Ω pull-up resistors should be connected to V

and pins OUT and OUTQ as close as

CCB

possible to the IC. However, for most applications these matching resistors are not required.

2001 Jun 25 7

Philips Semiconductors Product speciﬁcation

2.5 Gbits/s postampliﬁer with level detector TZA3014

handbook, full pagewidth

= 0.5 × V

LEVEL

LEVELVref

LEVEL=VCC

CCA

12 (15)

LEVEL

14 (17)

ref

o(se)(p-p)

×=

---------------------R1 R2+

for power-down mode.

LEVEL

100 Ω

REG

The numbers in parentheses refer to the pad numbers of the bare die version.

a. DC-coupled.

(27) 21

100 Ω

(29) 23

(28) 22

CCB

OUT

OUTQ

LEVEL

(V)

Transmission

lines

Ω

o(se)(p-p)

MGU126

Ω

handbook, full pagewidth

= 1.5 × V

LEVEL

LEVELVref

LEVEL=VCC

CCA

12 (15)

LEVEL

14 (17)

ref

o(se)(p-p)

×=

---------------------R1 R2+

for power-down mode.

LEVEL

100 Ω

REG

The numbers in parentheses refer to the pad numbers of the bare die version.

b. AC-coupled.

Fig.5 RF output configurations.

(27) 21

100 Ω

(29) 23

(28) 22

CCB

OUT

OUTQ

LEVEL

(V)

Transmission

lines

Ω

o(se)(p-p)

MGU127

Ω

2001 Jun 25 8

Philips Semiconductors Product speciﬁcation

2.5 Gbits/s postampliﬁer with level detector TZA3014

handbook, full pagewidth

o(se)(p-p)

(mV)

1000

800

DC-coupled AC-coupled

600

400

200

0 100

20 40 60 80

LEVEL

Fig.6 Output signal as a function of V

(% of V

LEVEL

MGU128

)

ref

TTL logic inputs MUTE and INV

It should be noted that switch control voltages in positive logicare inverted in case anegativesupply voltage is used (see Fig.7).

Output signal as a function of inputs MUTE and INV

The default logic level for inputs MUTE and INV is 0 in case these pins are not connected. See Tables 1 and 2.

2001 Jun 25 9

Table 1 OUT and OUTQ as a function of input MUTE

MUTE OUT OUTQ

0 IN INQ 1 ‘0’ ‘1’

Table 2 OUT and OUTQ as a function of input INV

INV OUT OUTQ

0 IN INQ 1 INQ IN

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