AKM AK5350-VF, AK4550VT Datasheet

ASAHI KASEI [AK4550]

M0068-E-01 2000/4

- 1 -

GENERAL DESCRIPTION

The AK4550 is a low voltage 16bit A/D & D/A converter for portable digital audio system. In the AK4550,
the loss of accuracy form clock jitter is also improved by using SCF techniques for on-chip post filter.
Analog signal input/output of the AK4550 are single-ended, therefore, any external filters are not required.
The AK4550 is suitable for portable digital audio system, as the AK4550 is lower power dissipation and a
smaller package than AK4518.

FEATURES

o HPF for DC-offset cancel (fc=3.4Hz)
o Single-ended ADC

- S/(N+D): 82dB@VDD=2.5V

- Dynamic Range, S/N: 89dB@VDD=2.5V

o Single-ended DAC

- Digital de-emphasis for 32kHz, 44.1kHz, 48kHz sampling

- S/(N+D): 85dB@VDD=2.5V

- Dynamic Range, S/N: 92dB@VDD=2.5V

o Audio I/F format: MSB First, 2’s Compliment (AK4518 compatible)

- ADC: 16bit MSB justified

- DAC: 16bit LSB justified

o Input/Output Voltage: 0.6 X VDD (=1.5Vpp@VDD=2.5V)
o High Jitter Tolerance
o Sampling Rate: 8kHz to 50kHz
o Master Clock: 256fs or 384fs or 512fs
o Power Supply: 2.3 to 3.6V
o Low Power Supply Current: 10mA
o Ta = -40 to 85°C
o Very Small Package: 16pin TSSOP

Modulator

MCLK

VDD

VSS

AOUTL

AINL

LRCK
SCLK

VCOM

AINR

∆Σ

Modulator

Decimation

Filter

Serial I/O

Interface

Common Voltage

SDTO

∆Σ

Decimation

Filter

SDTI

PWDA

DEM0

PWAD

Clock
Divider

AOUTR

8X

Interpolator

8X

Interpolator

∆Σ

Modulator

∆Σ

Modulator

LPF

LPF

DEM1

Low Power & Small Package 16bit ∆Σ CODEC

AK4550

ASAHI KASEI [AK4550]

M0068-E-01 2000/4

- 2 -

n Ordering Guide

AK4550VT -40 ∼ +85°C 16pin TSSOP (0.65mm pitch)
AKD4550 Evaluation Board for AK4550

n Pin Layout

1VCOM

AINR

VSS

AINL

VDD

DEM0

DEM1

SDTO

Top
View

2

3

4

5

6

7

8

AOUTR

AOUTL

PWAD

SCLK

MCLK

LRCK

SDTI

16

15

14

13

12

11

10

9

PWDA

PIN/FUNCTION

No. Pin Name I/O Function

1 VCOM O Common Voltage Output Pin, 0.45 x VDD
2 AINR I Rch Analog Input Pin
3 AINL I Lch Analog Input Pin
4 VSS - Ground Pin
5 VDD - Power Supply Pin
6 DEM0 I De-emphasis Control Pin
7 DEM1 I De-emphasis Control Pin
8 SDTO O Audio Serial Data Output Pin

9 SDTI I Audio Serial Data Input Pin
10 LRCK I Input/Output Channel Clock Pin
11 MCLK I Master Clock Input Pin
12 SCLK I Audio Serial Data Clock Pin
13 PWAD I ADC Power-Down & Reset Mode Pin

“L”: Power down. ADC should always be reset upon power-up.

14 PWDA I DAC Power-Down & Reset Mode Pin

“L”: Power down. DAC should always be reset upon power-up.
15 AOUTL O Lch Analog Output Pin
16 AOUTR O Rch Analog Output Pin

ASAHI KASEI [AK4550]

M0068-E-01 2000/4

- 3 -

ABSOLUTE MAXIMUM RATINGS

(VSS=0V; Note 1)

Parameter Symbol min max Units

Power Supply VDD -0.3 4.6 V
Input Current (Any Pin Except Supplies) IIN -

±10

mA
Input Voltage VIN -0.3 VDD+0.3 V
Ambient Temperature (power applied) Ta -40 85

°C

Storage Temperature Tstg -65 150

°C

Note:1. All voltages with respect to ground.

WARNING: Operation at or beyond these limits may results in permanent damage to the device.

Normal operation is not guaranteed at these extremes.

RECOMMENDED OPERATING CONDITIONS

(VSS=0V; Note 1)

Parameter Symbol min typ max Units

Power Supply VDD 2.3 2.5 3.6 V

Note:1. All voltages with respect to ground.

*AKM assumes no responsibility for the usage beyond the conditions in this data sheet.

ASAHI KASEI [AK4550]

M0068-E-01 2000/4

- 4 -

ANALOG CHARACTERISTICS

(Ta=25°C; VDD=2.5V; fs=44.1kHz; Signal Frequency=1kHz ; SCLK=64fs; Measurement frequency=10Hz ∼ 20kHz;
unless otherwise specified)

Parameter min typ max Units

ADC Analog Input Characteristics: Analog Source Impedance=470Ω (Note 2)

Resolution 16 Bits
S/(N+D) (-0.5dB Input) 72 82 dB
D-Range (-60dB Input, A-weighted) 82 89 dB
S/N (A-weighted) 82 89 dB
Interchannel Isolation 80 95 dB
Interchannel Gain Mismatch 0.2 0.5 dB
Input Voltage (Note 3) 1.35 1.50 1.65 Vpp
Input Resistance 50 100

kΩ

Power Supply Rejection (Note 4) 35 dB
DAC Analog Output Characteristics: (Note 5)
Resolution 16 Bits

S/(N+D) 75 85 dB
D-Range (-60dB Output, A-weighted) 86 92 dB
S/N (A-weighted) 86 92 dB
Interchannel Isolation 80 95 dB
Interchannel Gain Mismatch 0.2 0.5 dB
Output Voltage (Note 3) 1.35 1.50 1.65 Vpp
Load Resistance 10

kΩ

Load Capacitance 30 pF
Power Supply Rejection (Note 4) 50 dB

Power Supplies

Power Supply Current

AD+DA
AD
DA
Power down (Note 6)

PWAD

= “H”, PWDA = “H”

PWAD

= “H”, PWDA = “L”

PWAD

= “L”, PWDA = “H”

PWAD

= “L”, PWDA = “L”

10

5.6

5.6
10

15

8.4

8.4
50

mA
mA
mA

uA

Power Consumption

AD+DA
AD
DA
Power down (Note 6)

PWAD

= “H”, PWDA = “H”

PWAD

= “H”, PWDA = “L”

PWAD

= “L”, PWDA = “H”

PWAD

= “L”, PWDA = “L”

25
14
14
25

37.5
21
21

125

mW
mW
mW

uW

Notes: 2. The offset of ADC is removed by internal HPF.

3. Input /Output of ADC and DAC scales with VDD voltage. 0.6 X VDD(typ).

4. PSR is applied to VDD with 1kHz, 50mV.

5. Measured by AD725C (SHIBASOKU). RMS mode.

6. In case of power-down mode, all digital input including clocks pins (MCLK, SCLK, LRCK) are held VDD
or VSS. But PWAD

and PWDA pins are held VSS.

ASAHI KASEI [AK4550]

M0068-E-01 2000/4

- 5 -

FILTER CHARACTERISTICS

(Ta=25°C; VDD=2.3 ∼ 3.6V; fs=44.1kHz; DEM0=”1”, DEM1=”0”)

Parameter Symbol min typ max Units

ADC Digital Filter (Decimation LPF):

Passband (Note 7)

±0.1dB

-1.0dB

-3.0dB

PB 0

20.0

21.1

17.4 kHz
kHz
kHz

Stopband SB 27.0 kHz
Passband Ripple PR

±0.1

dB
Stopband Attenuation SA 65 dB
Group Delay (Note 8) GD 17.0 1/fs
Group Delay Distortion

∆GD

0us

ADC Digital Filter (HPF):

Frequency Response (Note 7) -3dB

-0.5dB

-0.1dB

FR 3.4

10
22

Hz

Hz

Hz

DAC Digital Filter:

Passband (Note 7)

±0.1dB

-6.0dB

PB 0

22.05

20.0 kHz
kHz

Stopband SB 24.1 kHz
Passband Ripple PR

±0.06

dB
Stopband Attenuation SA 43 dB
Group Delay (Note 8) GD 14.8 1/fs

DAC Digital Filter + Analog Filter

Frequency Response 0 ∼ 20.0kHz

FR

±0.5

dB

Notes: 7. The passband and stopband frequencies scale with fs (sampling frequency).
For examples, PB=20.0kHz(@ADC: -1.0dB, DAC: -0.1dB) are 0.454 x fs.

8. The calculating delay time which occurred by digital filtering. This time is from the input of analog signal to
setting the 16bit data of both channels to the output register for ADC. For DAC, this time is from setting the
16bit data of both channels on input register to the output of analog signal.

DC CHARACTERISTICS

(Ta=25°C; VDD=2.3 ∼ 3.6V)

Parameter Symbol min typ max Units

High-Level Input Voltage
Low-Level Input Voltage

VIH
VIL

70%VDD

-

-

-

-

30%VDD

V

V
High-Level Output Voltage (Iout=-20uA)
Low-Level Output Voltage (Iout=20uA)

VOH
VOL

VDD-0.1

-

--

0.1

V

V
Input Leakage Current Iin - -

± 10

uA