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bambadoo 6th September 2004 11:16 AM

AD1865N-J vs AD1865N-K
I currently have an Audio Note Dac with a "normal" AD1865N chip. However I have 2 pcs of AD1865N-J and 2 pcs AD1865N-K.
I want to change. I have read that N-K is the "best", but I read something on analogs homepage:


What am I missing? Is the 1865n-k a mono, and the others dual?
I thought all AD1865 dacs were dual dacs, as stated in the tchnical information.
I hope anyone can verify this information.

Best Regards


The AD1865 is a complete, dual 18-bit DAC offering excellent THD+N and SNR while requiring no external components. Two complete signal channels are included. This results in cophased voltage or current output signals and eliminates the need for output demultiplexing circuitry. The monolithic AD1865 chip includes CMOS logic elements, bipolar and MOS linear elements and laser-trimmed thin-film resistor elements, all fabricated on Analog Devices' ABCMOS process.

The DACs on the AD1865 chip employ a partially segmented architecture. The first four MSBs of each DAC are segmented into 15 elements. The 14 LSBs are produced using standard R-2R techniques. Segment and R-2R resistors are laser trimmed to provide extremely low total harmonic distortion. This architecture minimizes errors at major code transitions resulting in low output glitch and eliminating the need for an external deglitcher. When used in the current output mode, the AD1865 provides two 1 mA output signals.

Each channel is equipped with a high performance output amplifier. These amplifiers achieve fast settling and high slew rate, producing 3 V signals at load currents up to 8 mA. Each output amplifier is short-circuit protected and can withstand indefinite short circuits to ground.

The AD1865 was designed to balance two sets of opposing requirements, channel separation and DAC matching. High channel separation is the result of careful layout. At the same time, both channels of the AD1865 have been designed to ensure matched gain and linearity as well as tracking over time and temperature. This assures optimum performance when used in stereo and multi-DAC per channel applications.

A versatile digital interface allows the AD1865 to be directly connected to standard digital filter chips. This interface employs five signals: Data Left (DL), Data Right (DR), Latch Left (LL), Latch Right (LR) and Clock (CLK). DL and DR are the serial input pins for the left and right DAC input registers. Input data bits are clocked into the input register on the rising edge of CLK. A low-going latch edge updates the respective DAC output. For systems using only a single latch signal, LL and LR may be connected together. For systems using only one DATA signal, DR and DL may be connected together.

The AD1865 operates with 5 V power supplies. The digital supply, VL, can be separated from the analog supplies, VS and -VS, for reduced digital feedthrough. Separate analog and digital ground pins are also provided. The AD1865 typically dissipates only 225 mW, with a maximum power dissipation of 260 mW.

The AD1865 is packaged in both a 24-pin plastic DIP and a 28-pin SOIC package. Operation is guaranteed over the temperature range of -25C to +70C and over the voltage supply range of 4.75 V to 5.25 V.

Peter Daniel 6th September 2004 02:03 PM

According to digikey listing, they are all dual.

AD1865N-K-ND AD1865N-K IC DAC AUDIO DUAL 18BIT 24DIP Analog Devices Inc Non-Stock 30.68800
15 -
AD1865R-J-ND AD1865R-J IC DAC AUDIO DUAL 18BIT 28SOIC Analog Devices Inc 26 25.29000
AD1865R-ND AD1865R IC DAC AUDIO DUAL 18BIT 24SOIC Analog Devices Inc Non-Stock 19.67000
AD1865N-ND AD1865N IC DAC AUDIO DUAL 18BIT 24DIP Analog Devices Inc 8 21.08000
AD1865P-ND AD1865P IC DAC AUDIO DUAL 18BIT 28PLCC Analog Devices Inc Non-Stock 19.67000
18 -

Nisbeth 6th September 2004 04:21 PM

That must be a mistake. AFAIK the letters J & K refer to different grades of the same chip (J being standard and K being high-grade).


Peter Daniel 6th September 2004 05:00 PM


Originally posted by Nisbeth
That must be a mistake. AFAIK the letters J & K refer to different grades of the same chip (J being standard and K being high-grade).


AFAIK, this is actually the case.

bambadoo 6th September 2004 05:56 PM

Thanks for the information. Anyway the AD1865N-K plays beautifully in my AN dac right now "as we speak".
Do they need some break in period?
Bass seems a bit tighter though. Compared to the stock ad1865N

Best Regards

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