P R O D U C T B R I E F
STAC9766/67
Two-Channel, 20-Bit, AC’97 2.3 Codecs with
Stereo Microphone and Mic/Jack Sensing
Integrated Mixed-Signal Solutions
FEATURES
DESCRIPTION
For Rev. CC1 parts and beyond
High performance Σ∆ technology
AC’97 Rev 2.3 Complaint
SigmaTel’s STAC9766/67 (Revision CC1 and
beyond) are general purpose 20-bit, full duplex,
audio codecs conforming to the analog compo-
nent specification of AC’97 (Audio Codec 97 Com-
ponent Specification Rev. 2.3). The STAC9766/67
incorporates SigmaTel’s proprietary Σ∆ technol-
ogy The AC’97 codec is designed to achieve a
DAC SNR in excess of 103dB. The DACs, ADCs,
and mixer are integrated with analog I/Os, which
include four analog line-level stereo inputs, two
analog line-level mono inputs, two stereo outputs,
and one mono output channel. The STAC9766/67
includes digital input/output capability for support
of modern PC systems with an output that sup-
ports the SPDIF format. The STAC9766/67 is a
standard 2-channel stereo codec. With SigmaTel’s
headphone drive capability, headphones can be
driven with without an external amplifier.
20-bit full duplex stereo ADC & DACs
Independent sample rates for ADC & DACs
5-Wire AC-Link protocol compliance
20-Bit SPDIF Output
Full Stereo Microphone Pre-Amp
Internal Jack Sensing on Headphone &
Line_Out
Internal Microphone Input Sensing
Digital PC Beep Option
Extended AC’97 2.3 Paging Registers
Digital-ready status
General purpose I/O
The STAC9766/67 may be used as a secondary
codec, with the STAC9700/21/56/08/84/50/52 as
the primary, in a multiple codec configuration con-
forming to the AC'97 Rev. 2.3 specification. This
configuration can provide true six-channel, AC-3
playback required for DVD applications. The
STAC9766/67 communicates via the five-wire AC-
Link to any digital component of AC'97 providing
flexibility in the audio system design. Packaged in
an AC'97 compliant 48-pin TQFP, the STAC9766/
67 can be placed on the motherboard, daughter
boards, PCI, AMR, CNR, MDC or ACR cards.
Crystal Elimination Circuit
Headphone drive capability (50mW)
0, 10db, 20db, and 30 dB microphone
boost capability
+3.3V (STAC9767) and +5V (STAC9766)
analog power supply options
Pin compatible with STAC9700/21/56
1 0 0 % c o m p a t i b l e w i t h S TA C 9 7 5 0 / 5 2
SigmaTel Surround (SS3D) Stereo
Enhancement
The STAC9766/67 provides variable sample rate
Digital-to-Analog (DA) and Analog-to-Digital (AD)
conversion, mixing, and analog processing.
Energy saving dynamic power modes
Multi-Codec option (Intel AC'97 rev 2.3)
Six analog line-level inputs
103dB SNR LINE-LINE
ORDERING INFORMATION
Part Number
STAC9766T
STAC9767T
Package
Temp Range
0° C to +70° C
0° C to +70° C
Supply Range
48-pin TQFP 7mm x 7mm x 1.4mm
48-pin TQFP 7mm x 7mm x 1.4mm
DVdd = 3.3V, AVdd = 5.0V
DVdd = 3.3V, AVdd = 3.3V
2-9766-P1-4.0-0802