Specifications

Analog to Digital Converter (ADC)

Parameter	Value	Units
Number of Channels	4
Number of Bits	16
Range Modes	±10, ±5, ±2.5, ±1.25	Volts
Quantization Step Size	312.5 (Range=±10V) 156.25 (Range=±5V) 78 (Range=±2.5V) 39 (Range=±1.25V)	µV
Maximum Sample Rate1	1	MS/s
Input Impedance	>100k	Ω
Latency (Measurement to Data Ready)	800	ns
Input Filter Bandwidth (-3 dB)	400	kHz
Input Filter Delay (frequencies <100kHz)2	550	ns

Typical Noise of ADC³

Mode	Noise (RMS)	SNR4	Effective # of bits5
±10V	150µV	93.5 dB	15.2
±5V	100µV	91.0 dB	14.8
±2.5V	40µV	92.9 dB	15.1
±1.25V	35µV	88.0 dB	14.3

Digital to Analog Converter (DAC)

Parameter	Value	Units
Number of Channels	4
Number of Bits	16
Range Modes	±10	Volts
Quantization Step Size	312.5	µV
Maximum Sample Rate1	1	MS/s
Output Impedance	50	Ω
Update Latency6	1.0	µs
Output Filter Bandwidth (-3 dB)	175	kHz
Output Filter Delay (frequencies <100kHz)2	1.2	µs

Timing Resolution

Parameter	Value (Typical)	Units
Interrupt Timing Jitter7	100	ns
Interrupt Latency (Best-case)7	110	ns
Interrupt Latency (Worst-case)7	210	ns

GPIO & Trigger Lines

Parameter	Value	Units
Minimum Voltage	0	V
Maximum Voltage	3.3	V
Output Impedance	200	Ω
Logic Levels (Input & Output)	3.3V CMOS

---

1. Mega Samples Per Second (MS/s) across all channels. Sum of sample rate of all channels must not be greater than 1 MS/s. ↩
2. See Analog Response Time App Note for details on time delay caused by analog filters.↩
3. For Quarto hardware 5.1 and higher. For noise specs on earlier Quarto units, please contact qNimble. ↩
4. SNR defined as the ratio of power of a full-scale sine wave to the power of the noise.↩
5. Effective Number of Bits defined as the $\frac{SNR - 1.76}{6.02}$. See Wikipedia definition for more details. ↩
6. Time from executing writeDAC function to analog output starts changing. ↩
7. See Measuring Response Time for details on definition of latency and jitter. ↩