Micro Linear Corporation ML2009CP, ML2009CQ, ML2008IP, ML2008CQ, ML2009IQ Datasheet

March 1997

ML2008*, ML2009**

µP Compatible Logarithmic Gain/Attenuator

GENERAL DESCRIPTION

The ML2008 and ML2009 are digitally controlled
logarithmic gain/attenuators with a range of –24 to +24dB
in 0.1dB steps.

Easy interface to microprocessors is provided by an input
latch and control signals consisting of chip select and
write.

The interface for gain setting of the ML2008 is by an 8-bit
data word, while the ML2009 is designed to interface to a
16-bit data bus with a single write operation by hard­wiring the gain/attenuation pin or LSB pin. The ML2008
can be power downed by the microprocessor utilizing a
bit in the second write operation.

FEATURES

■ Low noise 0dBrnc max with +24dB gain

■ Low harmonic distortion –60dB max

■ Gain range –24 to +24dB

■ Resolution 0.1dB steps

■ Flat frequency response ±0.05dB from 0.3-4kHz

±0.10dB from 0.1-20kHz

■ Low supply current 4mA max from ±5V supplies

■ TTL/CMOS compatible digital interface

■ ML2008 is designed to interface to an 8-bit data bus;

ML2009 to 16-bit data bus

Absolute gain accuracy is 0.05dB max over supply

tolerance of ±10% and temperature range.

These CMOS logarithmic gain/attenuators are designed for * This Part Is End Of Life As Of August 1, 2000
a wide variety of applications in telecom, audio, sonar or ** This Part Is Obsolete
general purpose function generation.

BLOCK DIAGRAM

V

V

WR
CS
A0

CCVSS

+5 –5

IN

ML2008ML2009*

GND AGND

+

COARSE

–

RESISTORS/
SWITCHES

16 16

+

–

RESISTORS/
SWITCHES

DECODERS

8

REGISTER 0

D1–D8

FINE

1

REGISTER 1

8

PDN

V

CCVSS

+5 –5

V

IN

+

BUFFER

–

1

V

OUT

WR
CS

GND AGND

+

COARSE

–

RESISTORS/
SWITCHES

16 16

+

–

RESISTORS/
SWITCHES

DECODERS

9

REGISTER 0

9

D0–D8

FINE

+

BUFFER

–

V

OUT

1

ML2008, ML2009

PIN CONFIGURATION

ML2008

18-Pin DIP (P18)

D7

1

2

D6

3

D5

4

D4

5

WR

6

D3

7

D2

8

D1

GND

9

TOP VIEW

D8

18

V

17

CC

16

V

OUT

15

V

SS

14

AGND

13

V

IN

12

NC

11

CS

10

A0

18-Pin DIP (P18)

1

D7

2

D6

3

D5

4

D4

5

WR

6

D3

7

D2

8

D1

GND

9

20-Pin PLCC (Q20) 20-Pin PLCC (Q20)

D4

NC

WR

D3

D2

D5

D6

D7

D8

3212019

4

5

6

7

8

910111213

CC

V

18

V

OUT

17

V

SS

16

AGND

15

NC

14

NC

D4

NC

WR

D3

D2

D5

3212019

4

5

6

7

8

910111213

ML2009*

TOP VIEW

D6

D7

18

D8

17

V

CC

16

V

OUT

15

V

SS

14

AGND

13

V

IN

12

NC

11

CS

10

D0

CC

D8

V

18

V

OUT

17

V

SS

16

AGND

15

NC

14

NC

D1

TOP VIEW

GND

V

IN

CS

A0

PIN DESCRIPTION

NAME FUNCTION

V

SS

V

CC

GND Digital ground. 0Volts. All digital

AGND Analog ground. 0Volts. Analog input

V

IN

V

OUT

D8 Data bit, ATTEN/GAIN

D7 Data bit, C3

D6 Data bit, C2

D5 Data bit, C1

D4 Data bit, C0

Negative supply. –5Volts ±10%
Positive supply. 5Volts ±10%

inputs are referenced to this ground.

and output are referenced to this
ground.

Analog input

Analog output

GND

D0

CS

V

D1

TOP VIEW

IN

NAME FUNCTION

D3 Data bit, F3

D2 Data bit, PDN, F2 ML2008; F2 ML2009

D1 Data bit, F0, F1 ML2008; F1 ML2009

D0 Data bit, F0 ML2009 only

WR Write enable. This input latches the

data bits into the registers on rising
edges of WR.

CS Chip select. This input selects the

device by only allowing the WR signal
to latch in data when CS is low.

A0 Address select. This input determines

(ML2008 only) which data word is being written into

the registers.

2

ML2008, ML2009

ABSOLUTE MAXIMUM RATINGS

OPERATING CONDITIONS

(Note 1)

Temperature Range (Note 2)

Supply Voltage

VCC.................................................................... +6.5V

VSS......................................................................–6.5V

AGND with Respect to GND....................... VCC to V

Analog Inputs and Outputs ..... VSS –0.3V to VCC +0.3V

SS

ML2008CX, ML2009CX .......................... 0°C to +70°C

ML2008IX, ML2009IX ......................... –40°C to +85°C

Supply Voltage

VCC................................................................ 4V to 6V

VSS............................................................. –4V to –6V

Digital Inputs and Outputs... GND –0.3V to VCC +0.3V

Input Current Per Pin ........................................ ±25mA

Power Dissipation ........................................... 750mW

Storage Temperature Range ............... –65°C to +150°C

Lead Temperature (Soldering 10 sec.) ................. 300°C

ELECTRICAL CHARACTERISTICS

Unless otherwise specified, TA = T
Other Bits = 0, (0dB Ideal Gain), CL = 100pF, R
measured at 1.4V.

SYMBOL PARAMETER NOTES CONDITIONS MIN TYP MAX UNITS

Analog

AG Absolute Gain Accuracy 4 VIN = 8dBm, 1kHz –0.05 +0.05 dB

RG Relative Gain Accuracy 4 100000001 –0.05 +0.05 dB

FR Frequency Response 4 300-4000Hz –0.05 +0.05 dB

V

OS

I

CN

HD Harmonic Distortion 4 V

SD Signal to Distortion 4 V

PSRR Power Supply Rejection 4 200mV

Z

IN

V

INR

V

OSW

Output Offset Voltage 4 V

Idle Channel Noise 4 VIN = 0, +24dB, C msg weighted –6 0 dBrnc

Input Impedance, V

Input Voltage Range 4 ±3.0 V
Output Voltage Swing 4 ±3.0 V

IN

MIN

to T

, V

MAX

5V

4 1 Meg

= 5V ±10%, VSS = –5V ±10%, Data Word: D8 (ATTEN/GAIN) = 1,

CC

= 600Ω, dBm measurements use 600Ω as reference load, digital timing

L

NOTE 3

000000000 –0.05 +0.05 dB
000000001 –0.05 +0.05 dB
All other gain settings –0.1 +0.1 dB
All values referenced to 100000000
gain when D8 (ATTEN/GAIN) = 1,

= 8dBm when D8 (ATTEN/GAIN) = 0,

V

IN

VIN = (8dBm – Ideal Gain) in dB

100-20,000Hz –0.1 +0.1 dB
Relative to 1kHz

= 0, +24dB gain ±100 mV

IN

= 0, +24dB, 1kHz 450 900 nv/√Hz

IN

= 8dBm, 1kHz –60 dB

IN

Measure 2nd, 3rd, harmonic relative
to fundamental

= 8dBm, 1kHz +60 dB

IN

C msg weighted

, 1kHz sine, VIN = 0

P-P

on V
on V

CC
SS

–60 –40 dB
–60 –40 dB

3

ML2008, ML2009

ELECTRICAL CHARACTERISTICS

(Continued)

SYMBOL PARAMETER NOTES CONDITIONS MIN TYP MAX UNITS

NOTE 3

Digital and DC

V

IL

V

IH

I

IN

I

IN

I

CC

Digital Input Low Voltage 4 0.8 V

Digital Input High Voltage 4 2.0 V

Input Current, Low 4 V

Input Current, High 4 VIH = V

= GND –10 µA

IH

CC

10 µA

VCC Supply Current 4 No output load, VIL = GND, 4 mA

VIH = VCC, VIN = 0

I

SS

VSS Supply Current 4 No output load, VIL = GND, –4 mA

VIH = VCC, VIN = 0

I

CCP

I

SSP

VCC Supply Current, ML2008 4 No output load, VIL = GND, 0.5 mA
Powerdown Mode Only VIH = V

CC

VSS Supply Current, ML2008 4 No output load, VIL = GND, –0.1 mA
Powerdown Mode Only VIH = V

CC

AC Characteristics

t

SET

Settling Time 4 V

OUT

= 0.185V. Change gain from –24 20 µs

IN

V

to +24dB. Measure from WR rising
edge to when V

settles to within

OUT

0.05dB of final value.

t

STEP

Step Response 4 Gain = +24dB. V

OUT

Measure from V

= –3V to +3V step. 20 µs

IN

= –3V to when V

IN

OUT

V

settles to within 0.05dB of final value.

t

DS

t

DH

t

AS

t

AH

t

CSS

t

CSH

t

PW

Note 1: Absolute maximum ratings are limits beyond which the life of the integrated circuit may be impaired. All voltages unless otherwise specified are measured with

Note 2: 0°C to +70°C and –40°C to +85°C operating temperature range devices are 100% tested with temperature limits guaranteed by 100% testing, sampling, or by

Note 3: Typicals are parametric norm at 25°C.
Note 4: Parameter guaranteed and 100% production tested.
Note 5: Parameter guaranteed. Parameters not 100% tested are not in outgoing quality level calculation.

Data Setup Time 4 50 ns

Data Hold Time 4 50 ns

A0 Setup Time 4 0 ns

A0 Hold Time 4 0 ns

CS* Setup Time 4 0 ns

CS* Hold Time 4 0 ns

WR* Pulse Width 4 50 ns

respect to ground.

correlation with worst-case test conditions.

4