Datasheet TDA1387T Datasheet (Philips)

INTEGRATED CIRCUITS

DATA SH EET

TDA1387T

Stereo Continuous Calibration DAC
(CC-DAC)

Preliminary specification
Supersedes data of September 1994
File under Integrated Circuits, IC01

1995 Dec 11

Philips Semiconductors Preliminary specification

Stereo Continuous Calibration DAC (CC-DAC) TDA1387T

FEATURES

• Low power consumption

• Low total harmonic distortion

• Wide dynamic range (16-bit resolution)

• Continuous Calibration (CC) concept

• Single 3 to 5.5 V supply rail

• Output and bias current are proportional to the supply

voltage

• Fast settling time enables 2, 4 and 8 times
oversampling (serial input) or double-speed operation at
4 times oversampling

• Internal bias current ensures maximum dynamic range

• Wide operating temperature range (−40 to + 85 °C)

• I2S-bus input format (time multiplex, two’s complement,

TTL)

• No zero-crossing distortion

• Large DC output voltage compliance

• Contained in small outline package.

ORDERING INFORMATION

APPLICATIONS

• Portable digital audio equipment.

GENERAL DESCRIPTION

The TDA1387T is a member of a generation of
digital-to-analog converters which incorporates the
innovative technique of Continuous Calibration. The
largest bit currents are repeatedly generated from one
single reference current. This duplication is based upon an
internal charge storage principle and has an accuracy
which is insensitive to ageing, temperature and process
variations.

The TDA1387T is fabricated in a 1.0 µm CMOS process
and features an extremely low power dissipation, small
package size and easy application. The intrinsic high
coarse current accuracy combined with the implemented
symmetrical offset decoding method preclude
zero-crossing distortion and ensure high quality audio
reproduction. The CC-DAC is eminently suitable for use in
portable digital audio equipment.

TYPE NUMBER

NAME DESCRIPTION VERSION

TDA1387T SO8 plastic small outline package; 8 leads; body width 3.9 mm. SOT96-1

PACKAGE

1995 Dec 11 2

Philips Semiconductors Preliminary specification

Stereo Continuous Calibration DAC (CC-DAC) TDA1387T

QUICK REFERENCE DATA

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

V

DD

I

DD

I

FS

(THD + N)/S total harmonic distortion

S/N signal-to-noise ratio at

t

cs

BR input bit rate (pin 3) −− 18.4 Mbits/s
f

clk

TC

FS

T

amb

P

tot

supply voltage 3.0 5.0 5.5 V
supply current VDD= 5 V at code 0000H − 5.5 6.5 mA
full scale output current VDD= 5 V 0.86 1.0 1.14 mA

V

=3V − 0.6 − mA

DD

at 0 dB signal level −−88 −78 dB

plus noise-to-signal ratio

at 0 dB signal level − 0.004 0.012 %
at −60 dB signal level −−33 −24 dB
at −60 dB signal level − 2.2 6 %
at −60 dB; A-weighted −−35 − dB
at −60 dB; A-weighted − 1.7 − %
A-weighted at code 0000H 86 98 − dB

bipolar zero
current settling time to

− 0.2 −µs

±1 LSB

clock frequency −− 18.4 MHz
full scale temperature

−±400 × 10

−6

−

coefficient at pins 6 and 8
operating ambient

−40 − +85 °C

temperature
total power dissipation VDD= 5 V at code 0000H − 27.5 36 mW

= 3 V at code 0000H − 10 − mW

V

DD

1995 Dec 11 3

Philips Semiconductors Preliminary specification

Stereo Continuous Calibration DAC (CC-DAC) TDA1387T

BLOCK DIAGRAM

Fig.1 Block diagram.

1995 Dec 11 4

Philips Semiconductors Preliminary specification

Stereo Continuous Calibration DAC (CC-DAC) TDA1387T

PINNING

SYMBOL PIN DESCRIPTION

BCK 1 bit clock input
WS 2 word selection input
DATA 3 data input
GND 4 ground
V

DD

I

OL

REF 7 reference decoupling
I

OR

5 supply voltage input
6 left channel output

Fig.2 Pin configuration.

8 right channel output

FUNCTIONAL DESCRIPTION

The basic operation of the continuous calibration DAC is
illustrated in Fig.3 which shows the calibration and
operation cycle. During calibration of the MOS current
source (Fig.3a) transistor M1 is connected as a diode by
applying a reference current. The voltage Vgs on the
intrinsic gate-source capacitance Cgs of M1 is then
determined by the transistor characteristics. After the drain
current has been calibrated to the reference value I

ref

, the
switch S1 is opened and S2 is switched to the other
position (Fig.3b). The gate-to-source voltage Vgs of M1 is
not changed because the charge on Cgs is preserved.
Therefore, the drain current of M1 will still be equal to I
and this exact duplication of I

is now available at the

ref

ref

OUT terminal.
In the TDA1387T, 32 current sources and one spare

current source are continuously calibrated (see Fig.1). The
spare current source is included to allow continuous
converter operation. The output of one calibrated source is
connected to an 11-bit binary current divider which
consists of 2048 transistors. A symmetrical offset
decoding principle is incorporated and arranges the bit
switching such that the zero-crossing is performed by
switching only the LSB currents.

The TDA1387T (CC-DAC) accepts serial input data format
of 16-bit word length. Left and right data words are time
multiplexed. The input data format is shown in
Figs 4 and 5.

With a HIGH level on the WS input, data is placed in the
right input register, with a LOW level on the WS input, data
is placed in the left input register. The data in the input
registers are simultaneously latched to the output registers
which control the bit switches. An internal bias current I

bias

is added to the full scale output current IFS in order to
achieve maximum dynamic range at the outputs of OP1
and OP2.

The signal current IFS and the bias current I

are both

bias

proportional to the supply voltage VDD, and have a fixed
mutual relation A

(where A

bias

bias=Ibias/IFS

).

It is preferred that the non-inverting input of operational
amplifiers OP1 and OP2 is tied to ground to achieve a
maximum dynamic range over the supply voltage range.

A decoupling capacitor C4 is recommended for enhancing
the supply voltage ripple rejection of the DAC. It has no
significant effect on the noise performance.

1995 Dec 11 5

Philips Semiconductors Preliminary specification

Stereo Continuous Calibration DAC (CC-DAC) TDA1387T

(a) Calibration.
(b) Operation.

Fig.3 Calibration principle.

LIMITING VALUES

In accordance with the Absolute Maximum Rating System (IEC 134).

SYMBOL DESCRIPTION CONDITIONS MIN. MAX. UNIT

V

DD

T

xtal(max)

T

stg

T

amb

V

es

supply voltage − 6.0 V
maximum crystal temperature − +150 °C
storage temperature −55 +150 °C
operating ambient temperature −40 +85 °C
electrostatic handling note 1 −2000 +2000 V

note 2 −200 +200 V

Notes

1. Human body model: C = 100 pF; R = 1.5 kΩ; 3 zaps positive and 3 zaps negative.

2. Machine model: C = 200 pF; L = 0.5 µH; R = 10 Ω; 3 zaps positive and 3 zaps negative.

THERMAL CHARACTERISTICS

SYMBOL DESCRIPTION VALUE UNIT

R

th j-a

thermal resistance from junction to ambient in free air 210 K/W

1995 Dec 11 6

Philips Semiconductors Preliminary specification

Stereo Continuous Calibration DAC (CC-DAC) TDA1387T

CHARACTERISTICS

=5V; T

V

DD

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

Supply

V

DD

I

DD

SVRR supply voltage ripple

Digital inputs; WS, BCK and DATA

 LOW level input leakage

I

LI

I

 HIGH level input leakage

HI

f

BCK

BR data bit rate −− 18.4 Mbits/s
f

WS

Timing

t

r

t

f

T

cy

t

HB

t

LB

t

su;DA

t

h;DA

t

h;WS

t

su;WS

=25°C; unless otherwise specified.

amb

supply voltage 3.0 5.0 5.5 V
supply current at code 0000H − 5.5 6.5 mA

note 1 − 30 − dB

rejection

Vi=0V −− 10 µA

current

Vi=5V −− 10 µA

current
clock frequency −− 18.4 MHz

word select input frequency −− 384 kHz

rise time −− 12 ns
fall time −− 12 ns
bit clock cycle time 54 −−ns
bit clock HIGH time 15 −−ns
bit clock LOW time 15 −−ns
data set-up time 12 −−ns
data hold time 2 −−ns
word select hold time 2 −−ns
word select set-up time 12 −−ns

1995 Dec 11 7

Philips Semiconductors Preliminary specification

Stereo Continuous Calibration DAC (CC-DAC) TDA1387T

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

Analog outputs; I

OL

and I

OR

RES output resolution −− 16 bits
V

DCC

DC output voltage

0 − 3.5 V

compliance

I

o(p-p)

AC output signal current

note 2 0.86 1.0 1.14 mA

(peak-to-peak value)

TC

FS

full-scale temperature

−±400 × 10−6−

coefficient

I

bias

V

ref

R

ref

(TDH + N)/S total harmonic distortion

output bias current note 2 0.93 1.08 1.23 mA
output reference voltage note 2 −

1

⁄6V

DD

− V

output resistance at pin 7 7.6 11.4 14.8 kΩ

at 0 dB signal level; note 3 −−88 −78 dB

plus noise-to-signal ratio

at 0 dB signal level; note 3 − 0.004 0.01 %
at −60 dB signal level; note 3 −−33 −24 dB
at −60 dB signal level; note 3 − 2.2 6 %
at −60 dB; A-weighted; note 3 −−35 − dB
at −60 dB; A-weighted; note 3 − 1.8 − %
f

= 20 Hz to 20 kHz;

i

−−84 −70 dB

at 0 dB signal level; note 3
f

= 20 Hz to 20 kHz;

i

− 0.006 0.03 %

at 0 dB signal level; note 3

t

cs

current settling time to

− 0.2 −µs

±1 LSB

α

cs

∆I

 unbalance between

O

channel separation 86 95 − dB

note 3 − 0.2 0.3 dB

outputs

t

 delay time between outputs −±0.2 −µs

d

S/N signal-to-noise ratio at

A-weighted at code 0000H 86 98 − dB

bipolar zero

Notes

1. V

= 1% of the supply voltage; f

ripple

ripple

= 100 Hz.

2. Values are proportional to VDD.

3. Measured with 1 kHz sine wave generated at a sampling rate of 192 kHz.

QUALITY SPECIFICATION

In accordance with

Handbook”

. The handbook can be ordered using the code 9397 750 00192.

“SNW-FQ-611E”

. The numbers of the quality specification can be found in the

1995 Dec 11 8

“Quality Reference

Philips Semiconductors Preliminary specification

Stereo Continuous Calibration DAC (CC-DAC) TDA1387T

Fig.4 Input signal timing (I2S-bus).

Fig.5 Input signal format (I2S-bus).

1995 Dec 11 9

Philips Semiconductors Preliminary specification

Stereo Continuous Calibration DAC (CC-DAC) TDA1387T

APPLICATION INFORMATION

The TDA1387T offers great ease in designing-in to
printed-circuit board due to its small size and low pin count.
The TDA1387T being a mixed-signal IC in CMOS, some
attention needs to be paid to layout and topology of the
application PCB. The following basic rules will yield the
desired performance. The most important considerations
are:

1. Supply: care should be taken to supply the TDA1387T

with a clean, noiseless supply voltage, for a good
noise performance of the analog parts of the DAC.
Supply purity can easily be achieved by using an
RC-filtered supply.

2. Grounding: preferably a ground plane should be used,

in order to have a low-impedance return available at
any point in the layout. It is advantageous to make a
partitioning of the ground plane according to the nature
of the expected return currents (digital input returns
separate from supply returns separate from the analog
section).

3. Topology: the capacitor decoupling high-frequency

supply interference from VDD to GND should be placed
as close as is physically possible to the IC body,
ensuring a low-inductance path to ground. The digital
input conductors may be shielded by ground leads
running alongside. The placement of a passive ground
plane underside the entire IC surface gives ‘free’
additional decoupling from the IC body to ground as
well as providing a shield between the digital input pins
and the analog output pins.

1995 Dec 11 10

Philips Semiconductors Preliminary specification

Stereo Continuous Calibration DAC (CC-DAC) TDA1387T

PACKAGE OUTLINE

SO8: plastic small outline package; 8 leads (straight); body width 3.9 mm

Z

8

pin 1 index

D

c

5

A

2

E

H

E

SOT96-2

A

X

v M

A

Q

1

E

4.0

3.8

0.16

0.15

b

(2)

1.27

0.050

e

DIMENSIONS (inch dimensions are derived from the original mm dimensions)

UNIT A b

mm

inches

Notes

1. Plastic or metal protrusions of 0.15 mm maximum per side are not included.

2. Plastic or metal protrusions of 0.25 mm maximum per side are not included.

2

1.45

1.25

0.057

0.049

OUTLINE
VERSION

SOT96-2

p

0.49

0.36

0.019

0.014

0.25

0.19

0.0100

0.0075

(1)

cD

5.0

4.8

0.20

0.19

IEC JEDEC EIAJ

4

p

eHELQ Zwv

w M

0 2.5 5 mm

scale

6.4

6.2

0.252

0.244

REFERENCES

1.2

0.7

0.6

0.028

0.024

L

detail X

(1)

0.7

0.250.25

0.3

0.028

0.010.010.047

0.012

EUROPEAN

PROJECTION

ISSUE DATE

95-02-04
97-05-22

1995 Dec 11 11

Philips Semiconductors Preliminary specification

Stereo Continuous Calibration DAC (CC-DAC) TDA1387T

SOLDERING
Introduction

There is no soldering method that is ideal for all IC
packages. Wave soldering is often preferred when
through-hole and surface mounted components are mixed
on one printed-circuit board. However, wave soldering is
not always suitable for surface mounted ICs, or for
printed-circuits with high population densities. In these
situations reflow soldering is often used.

This text gives a very brief insight to a complex technology.
A more in-depth account of soldering ICs can be found in

“IC Package Databook”

our

Reflow soldering

Reflow soldering techniques are suitable for all SO
packages.

Reflow soldering requires solder paste (a suspension of
fine solder particles, flux and binding agent) to be applied
to the printed-circuit board by screen printing, stencilling or
pressure-syringe dispensing before package placement.

Several techniques exist for reflowing; for example,
thermal conduction by heated belt. Dwell times vary
between 50 and 300 seconds depending on heating
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 minutes at
45 °C.

(order code 9398 652 90011).

Wave soldering

Wave soldering techniques can be used for all SO
packages if the following conditions are observed:

• A double-wave (a turbulent wave with high upward
pressure followed by a smooth laminar wave) soldering
technique should be used.

• The longitudinal axis of the package footprint must be
parallel to the solder flow.

• The package footprint must incorporate solder thieves at
the downstream end.

During placement and before soldering, the package must
be fixed with a droplet of adhesive. The adhesive can be
applied by screen printing, pin transfer or syringe
dispensing. The package can be soldered after the
adhesive is cured.

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

A mildly-activated flux will eliminate the need for removal
of corrosive residues in most applications.

Repairing soldered joints

Fix the component by first soldering two diagonally­opposite end leads. Use only a low voltage soldering iron
(less than 24 V) applied to the flat part of the lead. Contact
time must be limited to 10 seconds at up to 300 °C. When
using a dedicated tool, all other leads can be soldered in
one operation within 2 to 5 seconds between
270 and 320 °C.

1995 Dec 11 12

Philips Semiconductors Preliminary specification

Stereo Continuous Calibration DAC (CC-DAC) TDA1387T

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.

1995 Dec 11 13

Philips Semiconductors Preliminary specification

Stereo Continuous Calibration DAC
(CC-DAC)

TDA1387T

NOTES

1995 Dec 11 14

Philips Semiconductors Preliminary specification

Stereo Continuous Calibration DAC
(CC-DAC)

TDA1387T

NOTES

1995 Dec 11 15

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513061/50/02/pp16 Date of release: 1995 Dec 11
Document order number: 9397 750 00519