Datasheet tda1381 DATASHEETS (Philips)

INTEGRATED CIRCUITS

DATA SH EET

TDA1381

DCC write amplifier (WRITE3)

Preliminary specification
File under Integrated Circuits, IC01

Philips Semiconductors

September 1994

Philips Semiconductors Preliminary specification

DCC write amplifier (WRITE3) TDA1381

FEATURES

• Single 3 V power supply

• Low standby current consumption

• 20 bidirectional current outputs (2 × nine heads)

• Single point main data and auxiliary current setting

• Reduction of power consumption between write pulses

• Soft switching of output currents

• Serial data input

• Timing is compatible with TDA1319T

• Uncommitted operational amplifier available.

GENERAL DESCRIPTION

The TDA1381 has been designed to drive an 18-channel
inductive recording head which is suitable for the DCC
(Digital Compact Cassette) system. The bidirectional
current outputs are controlled by a two-wire serial bus. The
amplitude of the write current pulses can be set by either
voltage or current control. The circuit can be switched to
standby mode to minimize supply current consumption.

QUICK REFERENCE DATA

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

V

DD

I

DD

I

DD(av)

I

stb

I

WDAT(max)

supply voltage 2.7 3.0 4.0 V
supply current note 1 − 912mA
average supply current note 2 − 26.5 − mA
total standby current − 0.1 0.3 mA
maximum write current for main data

note 3 100 −−mA

channels 0 to 7

I

WAUX(max)

I

EAUX(max)

P

d(av)

T

amb

maximum write current for auxiliary channel note 3 115 −−mA
maximum erase current for auxiliary channel note 3 153 −−mA
average power dissipation note 2 − 80 − mW
operating ambient temperature −30 − +85 °C

Notes

1. No head connected; all outputs unloaded; V

2. In the auxiliary and data write mode; writing DCC data; I
f

= 3.072 MHz. Data channels resistively loaded with 6 Ω, auxiliary channel resistively loaded with 4 Ω between

clk

DD

=3V.

= 60 mA; VDD=3V;

WDAT

pins 23 and 24, and 37 and 38.

3. Resistors connected in accordance with test circuit of Fig.7.

ORDERING INFORMATION

TYPE

NUMBER

NAME DESCRIPTION VERSION

TDA1381H TQFP48

Note

1. When using IR reflow soldering it is recommended that the Drypack instructions in the
(order number 9398 510 63011) are followed.

September 1994 2

PACKAGE

(1)

plastic thin quad flat package; 48 leads; body 7 × 7 × 1.4 mm SOT313-1

“Quality Reference Handbook”

Philips Semiconductors Preliminary specification

DCC write amplifier (WRITE3) TDA1381

BLOCK DIAGRAM

September 1994 3

Fig.1 Block diagram.

Philips Semiconductors Preliminary specification

DCC write amplifier (WRITE3) TDA1381

PINNING

SYMBOL PIN DESCRIPTION

V

DD

V

DD

AMP(pos) 3 operational amplifier non-inverting input
WCLK 4 write clock input
WDATA 5 write data input
V

SS

STANDBY 7 standby mode control input
AB 8 tape sector A or B select input
AMPO 9 operational amplifier output
AMP(neg) 10 operational amplifier inverting input
V

DD

V

DD

BJ 13 sector B write pulse output J
BI 14 sector B write pulse output I
n.c. 15 not connected
BH 16 sector B write pulse output H
BG 17 sector B write pulse output G
BF 18 sector B write pulse output F
BE 19 sector B write pulse output E
BD 20 sector B write pulse output D
BC 21 sector B write pulse output C
n.c. 22 not connected
BB 23 sector B write pulse output B
BA 24 sector B write pulse output A
V

DD

V

DD

V

SET

V

CNTR

V

SS

I

SET

V

SS

V

ref

R

BIAS

V

DD

V

DD

n.c. 36 not connected
AA 37 sector A write pulse output A
AB 38 sector A write pulse output B
n.c. 39 not connected
AC 40 sector A write pulse output C

1 supply voltage
2 supply voltage

6 ground

11 supply voltage
12 supply voltage

25 supply voltage
26 supply voltage
27 control voltage input
28 voltage-to-current conversion setting input
29 ground
30 control current input
31 ground
32 reference voltage output
33 bias current resistor
34 supply voltage
35 supply voltage

September 1994 4

Philips Semiconductors Preliminary specification

DCC write amplifier (WRITE3) TDA1381

SYMBOL PIN DESCRIPTION

AD 41 sector A write pulse output D
AE 42 sector A write pulse output E
AF 43 sector A write pulse output F
AG 44 sector A write pulse output G
AH 45 sector A write pulse output H
n.c. 46 not connected
AI 47 sector A write pulse output I
AJ 48 sector A write pulse output J

September 1994 5

Fig.2 Pin configuration.

Philips Semiconductors Preliminary specification

DCC write amplifier (WRITE3) TDA1381

FUNCTIONAL DESCRIPTION

The TDA1381 is designed to drive the elements of an
18-channel recording head, containing nine elements for
tape sector A and nine elements for sector B. A brief
functional description of each block (see Fig.1) is given
below.

Decoder

The IC is controlled by the 32-bit wide serial data word
which is clocked in at WDATA (pin 5). The clock frequency
(WCLK, pin 4) is 3.072 MHz with a clock period of 325 ns.
The write pulses are made available at the outputs
AA to AJ when tape sector A is selected (pin 8 HIGH) or at
the outputs BA to BJ when tape sector B is selected
(pin 8 LOW). The principle of connection of the recording
head to the IC is illustrated in Fig.4.

The timing sequence of the write pulses is shown in Fig.5.
The operating mode of the IC can be set by the first 3 bits
of WDATA. The signals TCH0 to TCH7 and TCHAUX
determine the direction of the write current. When TCH

HIGH, the current flows as indicated in Fig.4. When TCH
is LOW current flows in the opposite direction. The various
modes of operation are given in Table 1. The standby
mode can also be forced by setting the STANDBY input
(pin 7) HIGH.

Current control

The write current at the outputs is regulated by the current
control circuit. The principle of this circuit is shown in Fig.3.

The value of the current I
voltage V

, connected between pin 27 and VSS. In this

SET

can be set using an external

WDAT

configuration, pin 28 has to be resistively loaded to
another voltage source or V

(see Fig.7). The current

SS

control circuit regulates the voltage between pins 27 and
28 to zero. When a resistor R

is

n

pin 28 and V
as: G

SS

I

WDAT

=

-------------------- -

if



V



------------- ­R



SET
SET

, a current gain factor (Gif) can be defined

is connected between

set

Table 1 Modes of operation.

MODE WRITE CURRENT CONTROL BIT

MAIN DATA
CHANNELS

AUXILIARY

CHANNEL

MAIN DATA
CHANNELS

AUXILIARY

CHANNEL

(3)

PLAYBACK)

TDAPLB

CHANNEL

(DATA

(2)

TAUPLB

(AUXILIARY

CHANNEL

PLAYBACK)

Read read off off 1 1 X
Write read I
Write write I
Write erase I

WDAT
WDAT
WDAT

Read write off AW × I
Read erase off AE × I

off 0 1 X

AW × I

AE × I

WDAT

WDAT

WDAT

WDAT

000
001
100
101

(1)

(2)

n

TERAUX

(AUXILIARY

CHANNEL

ERASE)

Notes

1. Where 0 = LOW, 1 = HIGH and X = don't care.

2. When both TDAPLB and TAUPLB are HIGH, the IC is set to the standby mode.

and AE are multiplication factors (see Section “Current control”).

3. A

W

September 1994 6

Philips Semiconductors Preliminary specification

DCC write amplifier (WRITE3) TDA1381

Fig.3 Principle of the write current control circuit.

It is also possible to set the write current by providing a
current Ii into I
be connected to V

The current gain factor is now defined as:

(pin 30). In this configuration pin 27 must

SET

and pin 28 must be connected to VDD.

SS

G

=

if

I

WDAT

--------------- ­I

i

During AUX write (outputs AA, AB or BA, BB active) the
output current I

is increased by a factor AW. During

WDAT

the erase mode of the auxiliary channel
(TERAUX = HIGH, see Table 1), the output current I

WDAT

is increased by a factor AE.

September 1994 7

Outputs

Each channel of the chosen sector is selected in
sequence. Depending on the data word, the current is
directed forward or reversed through the heads. The
outputs that are not selected are kept floating to prevent
any incorrect current flow. In HIGH state (one of the
switches P is closed) the output is internally connected to

. In the LOW state (one of the switches N is closed) the

V

DD

output is connected to a current source.

Philips Semiconductors Preliminary specification

DCC write amplifier (WRITE3) TDA1381

Fig.4 Definition of the output currents.

Voltage reference

A reference voltage is available at pin 32. This voltage is
derived from a bandgap reference source, and can be
used to derive a control voltage for the current control
circuit.

Standby

The circuit is set to the standby mode when TDAPLB = 1
and TAUPLB = 1 (see Table 1), or when a HIGH level is
applied to pin 7. After a HIGH-to-LOW transition at pin 7,

the IC will remain in the standby mode until TDAPLB = 0
or TAUPLB = 0. When the IC is in the standby mode, the
current amplifier is switched off to minimize the power
consumption, all write current outputs are floating, and the
voltage reference is switched off.

Operational amplifier

An uncommitted operational amplifier is available for use
in a tape head temperature compensation circuit with the
read IC TDA1380.

September 1994 8

Philips Semiconductors Preliminary specification

DCC write amplifier (WRITE3) TDA1381

September 1994 9

Fig.5 Data format and timing sequence of the write pulses.

(1) Erase pulses are inverted every other cycle of 32 clock pulses.

Philips Semiconductors Preliminary specification

DCC write amplifier (WRITE3) TDA1381

LIMITING VALUES

In accordance with the Absolute Maximum Rating System (IEC 134); all voltages referenced to VSS (pins 6, 29 and 31);
all currents are positive into the IC.

SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT

V

DD

V

I

V

n

I

IW(max)

I

I(max)

I

n(max)

T

stg

T

amb

V

es

supply voltage −0.3 5.5 V
input voltage pins 4, 5, 7 and 8 −0.3 5.5 V
input voltage on other pins VDD+ 0.3 V < 5.5 V −0.3 VDD+ 0.3 V
maximum input current on write pulse

−200 +200 µA
outputs (pins 13, 14, 16 to 21, 23, 24, 37,
38, 40 to 45, 47 and 48)

maximum input current on supply and

−250 +250 µA
ground pins (pins 1, 2, 6, 11, 12, 25, 26,
29, 31, 34 and 35)

maximum input current on other pins

−10 +10 µA
(pins 3 to 5, 7 to 10, 27, 28, 30, 32 and 33)

storage temperature −55 +150 °C
operating ambient temperature −30 +85 °C
electrostatic handling note 1 −3000 +3000 V

note 2 −300 +300 V

Notes

1. Human body model: equivalent to discharging a 100 pF capacitor through a 1.5 kΩ series resistor.

2. Machine model: equivalent to discharging a 200 pF capacitor through a 25 Ω series resistor and a 2.5 µH series
inductor.

THERMAL CHARACTERISTICS

SYMBOL PARAMETER VALUE UNIT

R

th j-a

thermal resistance from junction to ambient in free air 65 K/W

September 1994 10

Philips Semiconductors Preliminary specification

DCC write amplifier (WRITE3) TDA1381

CHARACTERISTICS

VDD= 3 V (pins 1, 2, 11, 12, 25, 26, 34 and 35 tied together externally); T
test circuit of Fig.7; unless otherwise specified.

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

Supply

V

DD

I

DD

I

stb

P

d(av)

supply voltage 2.7 3.0 4.0 V
supply current note 1 − 912mA
total standby current standby mode − 0.1 0.3 mA
average power dissipation note 2 − 120 − mW

Digital inputs (pins 4, 5, 7 and 8)

V

IH

V

IL

I

LI

t

su

t

h

HIGH level input voltage 0.7V
LOW level input voltage −0.3 0 0.3V
input leakage current −10 0 +10 µA
WDATA set-up time see Fig.6 30 −−ns
WDATA hold time see Fig.6 30 −−ns

Analog inputs/output (pins 27, 28, 30, 32 and 33)

V
V
V
G

SET
CNTR
ref

if

input voltage (pin 27) 0.4 − VDD− 1.3 V
input voltage (pin 28) 0.4 − VDD− 1.3 V
output reference voltage (pin 32) Io< 500 µA 1.95 2.05 2.15 V
current gain factor with voltage input 550 700 850

with current input 590 720 850

amb

=25°C; f

DD

= 3.072 MHz; measured in

clk

V

DD

5.5 V

DD

V

Write pulse outputs (pins 13, 14, 16 to 21, 23, 24, 37, 38, 40 to 45, 47 and 48)

I

WDAT(min)

minimum output current channels

f

= 6.15 MHz −−20 mA

clk

0to7

I

WDAT(max)

maximum output current channels

note 3 100 −−mA

0to7

I

AUX(max)

maximum output current auxiliary

note 3 153 −−mA

channel

A

W

relative auxiliary write current

1.0 1.2 1.4 dB

increase

A

E

relative auxiliary erase current

3.0 3.7 4.4 dB

increase

∆I

WDAT

deviation between main data

note 4 −−0.5 dB

channels per sector

∆I

WDAT

------------------- ­∆T

temperature coefficient of the
output currents

note 5 − 200 × 10

−6

− K

−1

September 1994 11

Philips Semiconductors Preliminary specification

DCC write amplifier (WRITE3) TDA1381

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

Operational amplifier (pins 3, 9 and 10); note 6

G

o

B

G

V

o

V

i(cm)

Notes

1. No head connected, all outputs unloaded.

2. Auxiliary and data write mode; I

3. Maximum resistive load of auxiliary channel is 6.5 Ω; maximum resistive load of data channels is 10 Ω.

4. for channels 0 to 7, I

20 log

5. With constant V

6. RL> 100 kΩ; CL< 100 pF; load connected between pin 9 and VSS.

DC open loop gain − 45 − dB
gain bandwidth − 1 − MHz
output voltage (pin 9) 0.5 − VDD− 1.3 V
common mode input voltage

0.85 − V

DD

(pins 3 and 10)

= 100 mA.

WDAT

I

WDAT max()

-----------------------------­I

WDAT min()

SET

or I

(see Fig.7).

SET

WDAT

= 100 mA.

V

Fig.6 Timing relationship between the edges of

WCLK and WDATA.

September 1994 12

Philips Semiconductors Preliminary specification

DCC write amplifier (WRITE3) TDA1381

TEST AND APPLICATION INFORMATION

September 1994 13

Fig.7 Test circuit.

Philips Semiconductors Preliminary specification

DCC write amplifier (WRITE3) TDA1381

September 1994 14

Fig.8 Application diagram.

Philips Semiconductors Preliminary specification

DCC write amplifier (WRITE3) TDA1381

PACKAGE OUTLINE

handbook, full pagewidth

seating plane

9.3

8.7

48 37

1

pin 1 index

12

13

0.26

0.5

0.14

7.1

6.9

0.1 S

24

0.15MA

36

25

0.95

0.55

A

S

0.26

0.14

0.95

0.55

0.5

0.15MB

7.1

6.9

B

9.3

8.7

X

Dimensions in mm.

Fig.9 Plastic thin quad flat package; 48 leads; body 7 × 7 × 1.4 mm (TQFP48; SOT313-1).

September 1994 15

1.5

1.3

MSA396

0.20

0.04

detail X

0.7

0.3

0.66

0.56

0.18

0.12

0 to 7

o

1.70

1.35

Philips Semiconductors Preliminary specification

DCC write amplifier (WRITE3) TDA1381

SOLDERING
Plastic quad flat-packs

YWAVE

B
During placement and before soldering, the component

must be fixed with a droplet of adhesive. After curing the
adhesive, the component can be soldered. The adhesive
can be applied by screen printing, pin transfer or syringe
dispensing.

Maximum permissible solder temperature is 260 °C, and
maximum duration of package immersion in solder bath is
10 s, if allowed to cool to less than 150 °C within 6 s.
Typical dwell time is 4 s at 250 °C.

A modified wave soldering technique is recommended
using two solder waves (dual-wave), in which a turbulent
wave with high upward pressure is followed by a smooth
laminar wave. Using a mildly-activated flux eliminates the
need for removal of corrosive residues in most
applications.

Y SOLDER PASTE REFLOW

B
Reflow soldering requires the solder paste (a suspension

of fine solder particles, flux and binding agent) to be

applied to the substrate by screen printing, stencilling or
pressure-syringe dispensing before device placement.

Several techniques exist for reflowing; for example,
thermal conduction by heated belt, infrared, and
vapour-phase reflow. Dwell times vary between 50 and
300 s according to method. Typical reflow temperatures
range from 215 to 250 °C.

Preheating is necessary to dry the paste and evaporate
the binding agent. Preheating duration: 45 min at 45 °C.

EPAIRING SOLDERED JOINTS (BY HAND-HELD SOLDERING

R

IRON OR PULSE

-HEATED SOLDER TOOL)

Fix the component by first soldering two, diagonally
opposite, end pins. Apply the heating tool to the flat part of
the pin only. Contact time must be limited to 10 s at up to
300 °C. When using proper tools, all other pins can be
soldered in one operation within 2 to 5 s at between 270
and 320 °C. (Pulse-heated soldering is not recommended
for SO packages.)

For pulse-heated solder tool (resistance) soldering of VSO
packages, solder is applied to the substrate by dipping or
by an extra thick tin/lead plating before package
placement.

September 1994 16

Philips Semiconductors Preliminary specification

DCC write amplifier (WRITE3) TDA1381

DEFINITIONS

Data sheet status

Objective specification This data sheet contains target or goal specifications for product development.
Preliminary specification This data sheet contains preliminary data; supplementary data may be published later.
Product specification This data sheet contains final product specifications.

Limiting values

Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 134). Stress above one or
more of the limiting values may cause permanent damage to the device. These are stress ratings only and operation
of the device at these or at any other conditions above those given in the Characteristics sections of the specification
is not implied. Exposure to limiting values for extended periods may affect device reliability.

Application information

Where application information is given, it is advisory and does not form part of the specification.

LIFE SUPPORT APPLICATIONS

These products are not designed for use in life support appliances, devices, or systems where malfunction of these
products can reasonably be expected to result in personal injury. Philips customers using or selling these products for
use in such applications do so at their own risk and agree to fully indemnify Philips for any damages resulting from such
improper use or sale.

The Digital Compact Cassette logo is a registered trade mark of Philips Electronics N.V.

September 1994 17

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