LM4550BVH/NOPB National Semiconductor, LM4550BVH/NOPB Datasheet - Page 14

• Manufacturer Part Number: LM4550BVH/NOPB
• Description: IC AC '97 AUDIO CODEC 48-LQFP
• Manufacturer: National Semiconductor
• Type: Audio Codec '97r

Specifications of LM4550BVH/NOPB

• Data Interface: Serial
• Resolution (bits): 18 b
• Number Of Adcs / Dacs: 2 / 2
• Sigma Delta: Yes
• Dynamic Range, Adcs / Dacs (db) Typ: 90 / 89
• Voltage - Supply, Analog: 4.2 V ~ 5.5 V
• Voltage - Supply, Digital: 3 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 48-LQFP
• Audio Codec Type: Stereo
• No. Of Adcs: 2
• No. Of Dacs: 2
• No. Of Input Channels: 8
• No. Of Output Channels: 3
• Adc / Dac Resolution: 18bit
• Sampling Rate: 48kSPS
• Interface Type: Serial
• Supply Voltage Range: 3V To 5.5V, 4.2V
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: *LM4550BVH; *LM4550BVH/NOPB; LM4550BVH

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Pin Descriptions
Typical Performance Characteristics
V
3DP, 3DN
DV
DV
DV
DV
REF_OUT
AV
AV
AV
AV
Name
Name
V
NC
REF
DD1
SS1
DD2
SS2
DD1
DD2
SS1
SS2
29, 30
31, 32
43, 44
33,34
Pin
Pin
25
26
38
42
27
28
1
9
4
7
ADC Noise Floor
I / O
I / O
NC
O
O
O
I
I
I
I
I
I
I
I
(Continued)
Analog supply
Analog ground
Analog supply 2
Analog ground 2
Digital supply
Digital supply
Digital ground
Digital ground
Nominal 2.2 V internal reference
Not intended to sink or source current. Use short traces to bypass (3.3 µF, 0.1 µF) this pin to
maximize codec performance. See text.
Nominal 2.2 V reference output
Can source up to 5 mA of current and can be used to bias a microphone.
These pins are used to complete the National 3D Sound stereo enhancement circuit. Connect
a 0.022 µF capacitor between pins 3DP and 3DN. National 3D Sound can be turned on and
off via the 3D bit (bit D13) in the General Purpose register, 20h. National 3D Sound uses a
fixed-depth type stereo enhancement circuit hence the 3D Control register, 22h is read-only
and is not programmable. If National 3D Sound is not needed, these pins should be left open
(NC).
These pins are not used and should be left open (NC).
For second source applications these pins may be connected to a noise-free supply or
ground (e.g. AV
POWER SUPPLIES AND REFERENCES
3D SOUND AND NO-CONNECTS (NC)
20123715
DD
or AV
SS
), either directly or through a capacitor.
14
Functional Description
Functional Description
DAC Noise Floor
20123716